Reverse osmosis systems

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.

Question

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?

Answer

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.

Question

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? 

Answer

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.

Question

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?

Answer

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.

Question

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?  

Answer

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.

 

Question

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!

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.

Question

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?

Answer

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.

Question

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!

Answer

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.

Question

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?

Answer

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

Question

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?

Answer

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 info@rowa-wasser.de).

Question

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?

Answer

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.

Question

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?

Answer

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.

Question

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.

Answer

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.

Question

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?

Answer

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.

Question

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.

Answer

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.

Question

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.  

Answer

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.

Question

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.

Answer

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.

Question

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.

Answer

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.

Question

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?

Answer

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.

Question

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?

Answer

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.

Question

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.  

Answer

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
www.meerwasserweb.de

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

We are at your disposal for further questions.

Question

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

Answer

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.

 

Question

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?

Answer

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.