Reverse osmosis systems

Questions about reverse osmosis systems/spare parts

Reverse osmosis? What is this, anyway?

The ROWA RO systems work according to the principle of reverse osmosis. In reverse osmosis, the natural striving for balance is used.

If water of different salt concentrations is separated by an H2O-permeable membrane, a natural compensation takes place as water molecules penetrate the membrane and dilute the more saline solution. This creates a pressure difference, the so-called osmotic pressure. If a pressure far above the osmotic pressure is available, this process can be reversed (reverse osmosis).

In reverse osmosis, the water molecules penetrate the membrane from the saline side to the low-salt side. On the one hand, a concentrate is formed; on the other hand, desalinated water (permeate) is formed. The greater the pressure, the more sustainable this process is. The usual line pressure of 3–6 bars is sufficient for this and is the only energy that is needed.

However, so that the water on the concentrate side is not concentrated to such an extent that dissolved substances (e.g., calcium) precipitate and lie on the membrane in a blocking manner, the concentration must be controlled.
In our old ROWAsystem systems, this is done by the flushing valve, which is optimally adjusted in most cases with a ratio of four parts concentrate to one part permeate. By occasionally opening the flushing valve completely, any substances deposited on the membrane are removed.
The Sirius A has an automatic flushing system. A flow restrictor integrated into the hose is used in the ROWAaquarini box. Flushing is not necessary here.
You can find more theory, the structure of an RO membrane, etc. here.


How do you check whether a reverse osmosis system is still working properly?

In order to check a reverse osmosis system, the retention of the membrane must be determined. For this purpose, the conductivity or total hardness of raw water and pure water are measured, and the corresponding values are put in relation to each other. 

First, the reverse osmosis system is run for at least 15 minutes to produce permeate (pure water). If the system is allowed to run longer and the permeate is not examined immediately, the membrane retention improves significantly.Then a sample of the permeate is drawn, and the conductivity is determined with a corresponding measuring device or the total hardness with a drop test. Subsequently, either conductivity or total hardness are measured again in tap water (raw water) (both tests are often also carried out by aquarium shops).) 


Conductivity in raw water:    450 µS/cm
Conductivity in the permeate:    20 µS/cm

Residual salinity: 20 µS/cm x 100% / 450 µS/cm = 4.4 %
Retention: 100% minus 4.4% equals 95.6%

The membrane thus retains about 95% of the dissolved substances. 

Depending on the age of the membrane and the field of application, a retention of 90% is acceptable. In the seawater sector and in the case of high silicate values in raw water, a downstream MWSi module or a full desalinator module is often recommended, which removes the remaining dissolved salts.

(µS: micro second)

When does the pre-filter need to be changed?

In principle, the pre-filters must be replaced at least twice a year (see warranty conditions). In cases of poor raw water quality, a more frequent prefilter change will be necessary.

Our old ROWAsystem systems (except ROWAsystem mini, single-housing) have a pressure gauge that measures the pressure after the pre-filter. The adjustable red pointer should be adjusted 0.5 bars below the line pressure during commissioning. During the operating phase, the pressure at the pressure gauge will decrease, because the particles filtered out will worsen the permeability of the filter. 

The pre-filter should be replaced before the red pointer and the pressure gauge pointer overlap.

The ROWA Sirius A and the ROWAaquarini-box give an acoustic signal when a filter change is pending. So you will be automatically reminded of this.

Where can I download user manuals?

Due to the large number of systems built since 1987, please use our contact form and tell us for which system you need the operating instructions. If possible, please include the attachment number (a silver label with a six-digit number).

If you do not know the exact name, a photo of the plant will help us. Please send this along with your request to

Connection 50 GPD


I bought a GPD 50!

Is it possible that the description on the sketch is incorrect? This is about drawing wastewater and ultrapure water! When I connect the hoses in this manner, water comes out of the blue hose first, rather than the red hose as described! So how about the other way around?


You are right; the drawing is not entirely correct. Thank you for contacting us.

The pure water comes from the central connection (blue hose). The outlet located on its side belongs to the concentrate and must be connected to the flow limiter.

Can I drink the water from the ROWAsystem plants intended for aquaristics?


Can I drink the water from the Mini SL30-K ROWAsystem designed for aquaristics? I am worried because I have heard that the preservatives in the membrane can be harmful and/or anything but tasteless. Thank you for your help!


Yes, you can drink the water from the aquarium systems without hesitation. However, you should follow the operating instructions for the new systems and discard the pure water produced first. The preservative is washed out in the first hours. The exact times can be found in the corresponding operating instructions.

Pressure increase in the case of self-supplied water


Due to a low water pressure of 1.5 to 2.5 bars at my own water supply, I would like to switch a booster pump in front of the TURBO 200 ROWAsystem. 

This is included with the Sirius A. Can you please make me an offer? 


In the past, we had booster pumps in our range for small systems. Unfortunately, it is very difficult to get high-quality pumps for these low flow rates. That's why we removed the small booster pumps from the program a few years ago.
The pump used in the Sirius A requires a pre-pressure of at least 2.5 bars and is therefore not suitable either.

It would be possible to install a small domestic waterworks, which provides for an increase in pressure throughout the house. If you wish, we are happy to make you an offer.

ROWA Standard User Manual


I have a standard 90, St:0150-02/93 osmosis system and would like to connect it again. Unfortunately, I no longer have an instruction manual. Could you please send this to me?


Here you will find the operating instructions for your ROWA Standard from 1993 as a download.

Conversion SL90 to SL180


I have an SL 90 and would like to expand the system by another module to SL 180. Questions: Is that possible? If so, which parts do I need?


Of course, you can expand the system by adding a third housing. However, it is easier to simply replace the membrane. You can use our RO membrane TL-300 l/d (Item No. 052058) without any problems. The retention is comparable to the membrane L90 of your current system; however, the TL300 delivers about 300 l/d. So you can produce the required amount of pure water in a significantly shorter time.

Please keep in mind that the KF10 combifilter must be changed more frequently (at least every three months).

You can find information and operating instructions for the ROWAsystem   Turbo 300 here.

Order of filter inserts


I have changed all the filter inserts in my system.
But somehow the system is not running properly.
Must the filter insert MWSI in front of the membrane filter?
or behind it? Does the side with the two rubber seals have to be up or down when using the diaphragm insert?
Does the flushing valve always have to be on the membrane filter, or always on the last filter?
My system is running like this now:
The prefilter is at the front, then the filter with the membrane (but the two seals facing down), and then comes the MWSI filter with the purge valve.
Is that so right?


No, that's not right! It can't work that way. You have to rebuild the system immediately; otherwise, the membrane will break!

The order is: pre-filter membrane with a purge valve; post-filter

The pre-filter (KF 10) cleans the water of coarse and organic ingredients. The RO membrane removes the substances dissolved in the water. The water is "divided" into pure water (permeate) and rinsing water (concentrate). The concentrate is discharged via the flushing valve. The two seals belong at the head of the system. The collecting tube for the permeate is located inside the membrane. The permeate tap is always located in the system's head.
The permeate enters the post-filter. The MWSi removes the remaining silicate that has not been removed by the RO membrane.

By the way, the instruction manual with a flowchart can be found here  .

Filter change MB05


I have to change the MBO5 filter for my osmosis system. Do I have to let the water run for a certain amount of time after changing the cartridge (one of my ordered cartridges was for 2 hours, but I don't think it was the original packaging!) before I can let it run for use?  


If you have only changed the MB05, you can use the water immediately.

You should let it run for two hours when the membrane has been changed because there are preservatives in the membrane that must first be thoroughly rinsed out.


Additional SYSTEM head is required


In order to increase my ultrapure water output, I need the Rowa system head, Art No. 013006!
Can you help me with that?
Trade licenses are available!


Please contact our sales partner, Geisemann Aquaristic, through whom we also supply the resellers.  

Which flushing valve?


I have 6 dH raw water and require an additional flushing valve for this! What kind do I need for this, and where can I get it?
I would be grateful for an answer!


For which system do you need the flushing valve? 

The SV10 flushing valve  is used in our ROWAsystem  systems. Our new flushing valve has a forced flow of 10 l/h. For the ROWAsystem   systems, a permeate:concentrate ratio of 1:4 is recommended for membrane protection.

Replacement filter for ROWAsystem Mini SL30-K


I own a ROWAsystem Mini SL30-K system, and now I want to replace the combifilter and would like to know if the SF5 filter (Item No.  012105) is also enough. Or does it necessarily have to be the KF5 (KF5 Art. No.: 012106)? In addition, I would like to install an SF10 (Item No. 012110), including a separate housing in front of the osmosis system. Does this combination make sense, or is the upstream SF5 sufficient in any case and additional filtering is not necessary? Oh, by the way, I mainly use the water for the aquarium and as coffee water.


The SF5 is a pure sediment filter, i.e., it only filters out particles from the raw water. The KF-5 is made of pressed activated carbon and protects the membrane from chlorine and other oxidizing substances. In addition, it removes organic ingredients that attach to the activated carbon and thus relieves the membrane.

We have been using the KF5 for a long time, since the municipal pipelines are partially chlorinated, and chlorine destroys the membrane.

An additional SF10 sediment filter is only useful if your raw water is heavily contaminated with particles. A regular pre-filter change should be sufficient. If you produce a lot of pure water, you should reduce the change intervals.

Reduction of silicate and nitrate by ROWA reverse osmosis system


I am interested in the ROWA reverse osmosis system. However, it is critical to me that silicate and nitrate are also removed. Could you therefore tell me which substances in the water are reduced by the system and by what percentage?


In general, about 90-95% of the ingredients, based on conductivity, are removed from the reverse osmosis systems. About 80% of the silicate and nitrate are retained. The higher the concentration in the starting water, the higher the concentration in the pure water.  

If you require extremely pure water, add our  ROWAsystem  filter module with full desalinator MB05   (Item No. 011500). It is equipped with a high-performance mixed bed resin and removes the salts remaining in the permeate, including silicate and nitrate. The conductivity after the filter module must be checked regularly since silicates pass through the mixed bed resin very quickly. As soon as the conductivity increases again, the mixed-bed filter cartridge must be replaced. If necessary, it makes sense to switch two blocks in a row.

Service life KF10 at ROWAsystem 90 XL 90


I run a Rowa XL 90. How many liters does a 10-liter combifilter hold until I have to replace it? I let about 40 liters pass through during the week.
When do I need to replace the membrane? Is it correct that a membrane is only used up when it no longer allows water to pass through it?


The KF10 combifilter should be replaced every 6 months as long as the warranty still exists; otherwise, the warranty claim expires.

The service life of the membrane depends on various factors. In addition to the raw water quality, this also includes how often the pre-filter is replaced. Regular filter replacement protects the membrane.

If you only operate the system periodically, please make sure to flush the system before and after pure water production. During the production of pure water, please keep at least a ratio of 1:4 (pure water to concentrate).

The membrane must be replaced if the retention is no longer satisfactory. (Please see various articles in this area.)

The old plant has been restarted; how is its performance? 


I have a ROWA reverse osmosis system from 1988. It was in operation for 3 months at that time, after which I filled it with disinfectant, sealed it with plugs, and stored it to this day. Now I have put them into operation again, rinsed them, and they now produce water for aquarium purposes. The values of the starting water are LW 520, pH 7.5, GH 10, KH 3.5, and the permeate values are LW 150, pH 6.6, GH 2.5, and KH 1.0.

Is the performance capability still available, or would a new system be more effective?

PS: Congratulations on being still on the market and obviously the market leader!


Thank you for the congratulations!

Well, the system still manages to remove about 71% of the ingredients (based on the conductivity). To be honest, we are amazed that this still works after 20 years of storage.

Whether the restraint is still sufficient for you, you have to decide. It depends on the water quality you need. A new membrane removes 90% of the ingredients and is, of course, more effective. You certainly replaced the pre-filter before commissioning; you can also get the membrane as a spare part.

Spare parts for SL 90


We have a reverse osmosis system from you and need new filters. The system is dei SL90, and the filter model is ESPA 1-2012.

How much does it cost to replace the two filters?


The information about the required spare parts can be found here.

Please contact your supplier in Switzerland or the specialist aquarium trade for prices.

Filter module with demineralizer


A full desalinator from ROWA is offered commercially under the designation MB05B. I do not find any reference to this product in your technical information. For your information, there is the filter module MWSi, which is used for silicate removal and at the same time for hardening. Is the MB05B demineralizer still available? Where can I find technical information about this product?


The demineralizer building block is still there. The details can be found here.

Dripping faucet connection


I have been using a ROWA KM90 reverse osmosis system for about 20 years. The faucet connection has been dripping recently. Directly where the black hose is inserted into the faucet connection. If you pull out the hose, it no longer drips. Is it possible that you can send me a spare part so that I can replace the faucet connection?


It is best to replace the faucet connection (Item No. 013050) completely. After such a long time, deposits may have formed that cause the dripping.

Please contact your dealer for the replacement connection.

Operating instructions for used equipment


I bought a used osmosis system from ROWA, but I can't find an instruction manual.

On the back, there is the following marking:
ROWA Osnabrück
ST 0724-08/91

Can you send me an instruction manual, and are there any spare parts for this system?


Spare parts are certainly still available, even if it is a system from 1991.

You can always use our L90 (Item No. 052010) as a replacement diaphragm.

This is probably an old ROWA standard. In order to identify the plant exactly, you would have to email us a photo (please contact

Replacement gasket for ROWAsystem


Are there any replacement gaskets for the ROWAsystem SL 90 system?


Of course, there are replacement gaskets. The O-ring for the system housing has the item number 073215. O-rings for the plugs (item no. 013025), diaphragms or filter heads (item no. 013026), or the connecting pipe (item no. 013028) are also available. O-rings for the screw-in connectors are not available separately.

Can Kombifilter KF10 be replaced by MB05?


Your SL 180 osmosis system is equipped with a KF10 combination filter. Is it possible to replace the combifilter with the replacement filter MB05 for full desalination?


No, this is not possible. 

The KF10 combifilter is a prefilter for the reverse osmosis system. The KF10 filters the tap water before it is passed over the membrane so that any contaminants or oxidizing agents (e.g., chlorine) present do not pollute or destroy the membrane.

The MB05 is a fully functional desalinator module that serves as a post-filter after the membrane. The mixed bed resin contained therein removes the remaining salts remaining in the permeate (pure water). As a result, they can achieve a conductivity < of 1 µS/cm. This filter module is often used in seawater aquariums to prevent problems with diatoms.

Replacement filter KM90


I need new filters for my system (KM90). Please let me know which filters I can use for this system.


You need the Combifilter KF10 (Item No. 012210) as a pre-filter. If the membrane also needs to be replaced, please use the  RO membrane 1812-L-90 l/d (Item No. 052010) as a replacement membrane.

Activated Carbon Filter for SL90


I wanted to order a fine filter and a carbon filter for the osmosis system SL90.
My dealer has now informed me that there is only one combifilter left.
Is that correct?


We have removed the old AK10 activated carbon filter in bulk from the program.

The KF10 combifilter belongs to the ROWAsystem SL90. This activated carbon block filter is a fine filter and an activated carbon filter in one. In order to extend the service life of the combifilter, you can additionally connect the SF10 fine filter (Item No. 012110) upstream if you have an older, three-housing device.

Flushing valve SV 13, PA


I require one flushing valve SV13, PA, item number 053160.

How or where can I get this? In addition, I still need filter inserts. Please make me a free and non-binding offer.

Suitable for ROWA 10" filter housing

1 Prefilter Piece, 5 m  
1 insert piece for increasing carbonate hardness  
1 empty filter insert can be filled however desired  .


You can get the flushing valve, as well as all other spare parts, from your specialist aquarium dealer or from a specialist mail order company, e.g., Zoo-Zajak.

Operation of desalination units at SL90


I have a UOA SilverLine 90 from Rowa in use.As I have seen, they offer an additional module for this system for silicate removal.

I run the plant once a week and produce 20–30 liters of water. Then she stands in the closet for a week. Is the demineralizer module suitable for such an operation?

Thank you very much for your reply.


Of course, you can expand your ROWAsystem system with these building blocks. 

Please note, however, that you are talking about two different building blocks. The building block with special granules, MWSi, is used specifically for silicate removal. A slight hardening of the water can take place. As a result, the conductivity of the water after the building block is slightly higher than the conductivity of the permeate. The demineralizer module removes not only the silicate but all the salts remaining in the permeate. In this case, you will receive demineralized water with a conductivity < of 1 S/cm.

In the case of periodic operation, the block could become contaminated. You can, to be sure, discard the first 2–3 liters of the produced water.

Setting smaller Permeate: Concentrate ratio


I bought the Rowa osmosis system SL 90 yesterday.
Device Number: 080344
Membrane number: 0508000231.
In the operating instructions, it is pointed out that in the case of soft or softened raw water with a ratio up to a maximum of 2:1, the machine can be operated. Please ask which flushing valves are available.
The municipal utilities have informed me that we have hardness grade 1. Does it make sense here to increase the throughput of permeate so that I
achieve a ratio of 3:1 or 2:1. How high does the flow have to be per minute, and do I need a different flushing valve for this?
I would like to thank you in advance for your answer.


The division into degrees of hardness is very rough. There are three hardness levels, which are also known as soft, medium, and hard. 

We always start from the total hardness [°DH]. This differs from the degree of hardness. The term "soft" covers a total hardness up to 8.4 °Dh, "medium" means 8.4–14 °Dh, and "hard" means over 14 °Dh.

Only if the total hardness is less than 4 dH could the ratio be changed in this plant. For this type of system, a 1: 2 ratio is only possible with softened water. 

In order not to damage the valuable reverse osmosis membrane and to prevent blocking of the membrane, you should operate the system with a ratio of 1:4. The better the deposits are flushed from the membrane, the longer a smooth operation is possible.

Difference between a dead-zone-free membrane - Lip Seal


I have a question about the membranes of the Turbo and XL systems. What is the difference between the two 10" membranes T90 - deadzone-free and TL200 with lip seal?


The difference between the two membranes can be found here.

However, we would like to point out that we are no longer producing the XL line.

Nitrate content in pure water


I use your reverse osmosis system, which produces 50 GPD, and when I measure the nitrate content of pure water, it is about 15 mg/L. How can this be possible?


Please check the retention of your system with the help of the conductivity or the overall hardness. The most informative is the conductivity.  

If these values are OK, the retention of the membrane is also OK. Although the membranes do not retain all the ingredients equally well, they also do not select; i.e., it cannot be that only nitrate is poorly retained. In this case, the nitrate test should be checked.

Series connection of two XL90 systems


Is it possible to connect two Rowa XL90 osmosis systems together and run them in series?  
Since my membrane has broken and a new one will soon cost as much as the whole plant, I thought I could use the old one as a pre-filter with peat or something similar.


To increase the liter capacity, series switching could be used. However, this would definitely require a new membrane, and an extensive conversion of the two systems would be necessary.

We can only advise against additional filtering via peat or similar. The pre-filters are used to protect the membrane from contamination. By filtering via activated carbon, oxidizing agents present in the water, such as chlorine, and organic compounds are rendered harmless. Our KF10 combifilter is an activated carbon block filter that also serves as a sediment filter, i.e., it filters particles up to a size of 5 microns out of the water.  

If you would like additional pre-filtering, it would only make sense to use a pure sediment filter, the SF10 fine filter, as an additional coarse filter. In this case, the SF10 would be used before the KF10. The service life of the KF10 could possibly be extended in this way.

Perhaps you should think about additional post-filtering. You could send the permeate through a demineralized MB05 cartridge (Item No. 012511) to get demineralized water.

Flow direction in the MWSi block


The user manual of the MWSi filter module describes that the inlet is located on the right side. At the same time, the ROWA lettering is shown on the front of the illustration. But when I now look at my filter module from the top with the lettering facing forward, it says "IN" on the black cover plate on the left and "OUT" on the right side. This would suggest an opposite montage to me. Should I trust the cover or instructions?


Please trust our instruction manual. The lettering on this module must point to the rear so that the filter cartridge is properly flown through (from top to bottom).  

If you were to install the block with lettering on the front, the flow direction would be reversed; the filter cartridge would be flowed through from the bottom to the top. Special granulate could leak out over a longer period of time and possibly clog the cartridge.

Installation of booster pump P90


One of my customers bought a booster pump P90.2 for a reverse osmosis system SL90, which I purchased from Giesemann. Now it is not clear to him how it must be connected. Unfortunately, neither do I.  

The drawing says that the pump should be installed between the pre-filter and the reverse osmosis module. Does this mean that the pump is installed between the combifilter module and the membrane module? Then it would have to be connected where the pressure gauge is screwed in. Or is the pump already installed before the combination filter?  

I would be very happy with an explanation.  


Yes, in order to extend its service life, the pump should be installed between the combination filter (1st housing) and the diaphragm (2nd housing). For this purpose, the two housing heads are separated from each other, and two 6-inch screw-in connectors are installed instead of the connecting pipe. The pump can then be connected via a hose connection.

Installation of the MWSi module


One wants to connect the MWSi to the SL90. When screwed, the system header is the ROWA lettering on the front. Screws are already in the MWSI. It is screwed to the right of the SL90. Who or what is wrong now? Thanks for the reply.


The ROWA lettering on the MWSi module must not be legible, i.e., it points to the wall. If the nuts are inserted incorrectly, please excuse this. The user manual can be found here.

Spare parts for old Mini Q30


I still own an old UOA and wanted to ask which membrane or filter I would need as a replacement.
On the inside, the bez is located on the membrane. Q30
The plant should date from about 1992.

Is there anything else there?
Is the replacement worth it at all, or are new plants significantly more effective in terms of water consumption?
This amount of water would be enough for me.


Of course, there are still spare parts for this system.

Although the ROWAsystem Mini Q30 with a dead-zone-free membrane is no longer available in our product line, the membrane and pre-filters of the also single-housing ROWAsystem Mini SL30 can be used as a replacement. Please use the RO membrane 1807-L-30 l/d and the fine filter SF5

You can get prices from your aquarium dealer or from specialist mail-order companies, e.g., Zoo-Zajak.  

In comparison to the old ROWA  systems, the permeate:concentrate ratio has not changed.

Spare parts and operating instructions


I have a plant with 4 tanks, a solenoid valve, and a purge valve. It might be a RowaSystem turbo KTM 200. Are there any spare parts and an instruction manual? The flushing line is always full of water.


You will still receive spare parts for all ROWAsystem systems. The operating instructions for the identical ROWAsystem Turbo 200 can be found here. In the new TURBO systems, membranes with a lip seal are installed instead of the dead-zone-free membranes.

Four housings could also be a KTM 400 with a downstream filter module. Then please refer to the  ROWAsystem TURBO 400 instruction manual. 

We are at your disposal for further questions.

The new ROWAsystem Mini SL 30's high liter output 


I bought a reverse osmosis system (Mini SL 30 device No. 080085) 4 weeks ago. Since the beginning, I have always had too much permeate to concentrate. No matter how I averaged out I'm currently running the system with the flushing valve and forced passage closed.During a conductance measurement, a value of 60 came out. For aquarium water, the setpoint is exceeded by 3 times (i.e., 20 with normal function).

My aquarium's phosphate and nitrate levels are also extremely high.Can you please tell me how to proceed? I need a functional system.

I would like to thank you very much for your efforts.


Our 30 l membranes sometimes produce significantly more permeate per day. I. e. a higher pure water output is quite OK. The permeate : concentrate ratio of 1 : 4 must be adjusted accordingly, otherwise the membrane will block due to the insufficiently rinsed salts and will be destroyed. If you unscrew the purge valve a little further, more concentrate will flow out, but the amount of pure water produced will not change. Only that ratio of concentrate to permeate changes accordingly. 

You must always set the conductivity of the permeate in relation to the raw water. The plants retain about 95% of the dissolved salts. 20 µS / cm would therefore correspond to a conductivity in the raw water of about 400 µS / cm. What is the conductivity of your tap water? The conductivity in the permeate should only be measured after at least 30 minutes of pure water production, as the retention of the membrane improves during this time.

If the retention of the membrane is OK, but the conductivity of the permeate seems too high to you, a downstream full desalinator module (Item No. 011500) is the solution. This building block removes the salts remaining in the permeate and they obtain a conductivity below 3 µS / cm.

2. High phosphate value in the aquarium:
Here, of course, we recommend ROWAphos. ROWAphos lets you get your phosphate problem under control with absolute certainty.

3. High nitrate value in the aquarium:
Here you can have a regulating effect by changing water, possibly less food and strengthening the nitrate-exploiting bacteria. ROWAbac is the product that contains the bacteria needed for this.

Detailed information about the recommended products can be found under the corresponding links.

We are happy to answer any questions you may have.

Order Item 060902


I would like to order two of your products. 
Art.Nr. 060902 and Art.Nr. 011615

Could you please put together a list of possible dealers for the Berlin area? 

What does it cost, Art.Nr. 060902?

Or, and I would prefer that, could I order the products directly from you? By last name, credit card, or bank transfer?  


Thank you for your interest in our products.

You can get our Sirius, for example, via Aquarien-Meyer or via the water shop. You will receive the price information in a separate e-mail.

The float switch control (SSS) is normally used for filling a storage container. Since you will not need a storage container with the Sirius, an SSS is also not necessary.

Unfortunately, you cannot order the system directly from us.

Required spare parts


Hello, we have a reverse osmosis system with three blue containers and a number (042416) and would have to change the usual wearing parts.
However, we do not know the exact name. For which parts do we have to place the order?


According to our documentation, your system is a ROWAsystem TURBO 400.

The only common spare part is the KF10 combifilter (Item No. 012210). If the liter capacity or retention of the membranes is no longer in order, you must replace the membranes (Item No. 052015).

All other parts do not need to be replaced until a malfunction occurs. The replacement filter can be ordered from your dealer or a specialized mail-order company.

Replacement filters for ROWAsystem


Where can I get the filter cartridges (individually) as a spare part for the RowaSystem?

Gladly via the online shop.


You can find all parts, e.g., at Zoo Zajak (, or order directly from your dealer.

Spare parts for old equipment


I got an older osmosis system with the marking ST-0452-07/91.
You can still get spare parts and an instruction manual for this. How should the system be connected to the water network?


There are certainly still spare parts for this system. However, the system dates back to 1991, and we can no longer understand which system it is based on the number. Please describe them to us briefly.

For example, it could be a ROWA standard. It consists of: 3 white housings, of which 1 housing is longer (membrane housing, replacement membrane, e.g., Item No. 052010) and 2 smaller, thinner housings of the same size, one of which has a red inscription (Item No. 052020) and the other with a blue inscription (Item No. 052025).

If the water supply system is equipped with a 6 mm hose connection, you can use our faucet connection (Item No. 013050). The raw water must first be passed through one (or more) pre-filters and then over the membrane. In order to familiarize yourself with the technology in principle, we recommend the operating instructions of our ROWAsystem SL 90.

Before you get spare parts, you should check the diaphragm. You can find out exactly how this works here.

Suitable diaphragm for XL90


Could I use a RO membrane (1812-TL-200-l/d) with lip seal for my XL-90 because I got it as a gift?


Yes, you can install the RO diaphragm 1812-TL-200-l/d (Item No. 052015) in the XL90 housing. You just need to remember to adjust the purge valve according to the greater diaphragm power and change the combi filter more often. Please refer to the ROWAsystem Turbo 200 instruction manual.



For about a year, I've used the Rowa Turbo 400 device 0600659 with membrane numbers 2308894 and 2308889 and a downstream silicate filter as an osmosis water supplier in my Meeresaqua.

Unfortunately, I failed to rinse. Now I have flushed, and there is only a small amount of pure water with the valve almost closed.  

What spare parts do I require; are there any useful accessories, such as an automatic flush valve? Is there a service technician I can schedule an exam with? Ask for information about a regionally experienced dealer.  


Unfortunately, their membranes are blocked. because they did not flush the system and probably had also closed the flush valve to a large extent. Please pay attention to the correct permeate-to-concentrate ratio if you have replaced the membranes.

The flushing valve must be set to the amount of pure water as described in the operating instructions. Only a 13-liter flush valve is installed in these systems. When you shoot it, about 13 l/h will flow out. At a pure water output of about 400 l/d (i.e., about 17 l/h), 4 times the amount of concentrate, i.e., about 68 l/h, is required. The flushing valve must therefore be clearly open!

You need 2 new diaphragms (item no. 052015) and a new combination filter (item no. 012210). An automatic flushing valve is a possibility, as long as the raw water is not too hard. the instruction manual of the car. SV can be found here  .

Unfortunately, maintenance at your home is not possible.  We can name ROWA dealers in your area:

Dipl.-Oec. Heinz Wagner
Marine Aquaristics
+49 345 6858554

Stoczek Zoo [and] Co. Leipzig GmbH
+49 345 2905544

We are at your disposal for further questions.

Spare parts for old ROWA system


I have a three-part Rowa reverse osmosis system that is about 22 years old. Are there any additional parts, and if so, where?


Of course, there are still spare parts for our old systems!

But first, it needs to be clarified which plant it is. If you don't remember the name, please describe the facility to us. Presumably it is a ROWA standard (white membrane housing, two smaller, thin, white filter cartridges, one with blue and one with red writing, which are attached directly to the membrane housing).

With an already "quite old" system like yours, the retention of the membrane should first be checked before investing in new filters or membranes. This is explained in the Support section under the question "How to check whether a reverse osmosis system is still working properly?"

In principle, your dealer can order any spare part from us via his wholesaler, or you can obtain it directly from the mail-order specialty trade. In this case, it should be clarified in advance exactly what you need. so that we can give you the correct art. -No.

Difference XL90 - SL90


Is there still an XL90? This is often offered on the Internet. What is the difference with the SL90?


Yes, the XL90 (Item No. 010090) is still available at the moment.

There are two main differences between the two systems. Another type of membrane, the dead-zone-free membrane, is used in the XL90. A lip-sealing membrane is installed in the SL90.

The dead-zone-free membrane comes from medical technology, and this size is custom-made for our ROWAsystem   enclosures. Dead-zone-free means that the membrane closes directly with the housing, allowing for the formation of small "dead zones" with low water exchange.Dead-zone-free membranes are required as a standard in medical technology because the risk of contamination is significantly reduced by complete water exchange.

In addition, a very high-quality flushing valve with a nickel-plated metal body is used in the XL90. The solid design prevents the flushing valve from being closed too much. We install a PA flush valve, also preset, in the SL90.


Which plant? Maintenance intervals?


I bought a ROWA osmosis system with the device number 0511480 and the membrane number 203117 (last digits 1 or 8 are not readable) about 2 years ago. 
Can you tell me what plant it is? How and how often does the filter need to be serviced? What do I need for maintenance?


Your machine is a ROWAsystemSL90. The pre-filter used is the  KF10, which should be changed twice per year.

Installation of the MWSi module


The installation instructions for the filter module MWSi (No. 011600) state that the inlet is on the right. Only when I connect the block to the system 90 KM 90 (No. 010090), the wall bracket of the block is then in front (since the font should point to the back).

is not particularly useful for a wall mount. Or did I understand something wrong during the assembly? We haven't changed anything about the basic system, have we?


In the case of the MWSi, it is important that the flow direction in the block be taken into account. This flow direction is predetermined by the openings and connections in the SYSTEM header. If you leave the lettering at the front during a head-to-head installation, the material flows through the other way and can clog the filter candle.

The wall bracket is not required when mounting on a KM90 if the first two heads have been fixed accordingly.

User manual


I bought an XL90 system in Belgium. Unfortunately, the instruction manual is only in French and Flemish.
Is it possible to get a manual in German?


The corresponding operating instructions are available for download on the Internet at ROWA-Products - Reverse Osmosis - EXTRA LINE.