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Differences between Membranes of Various Manufactures

Is RO water too pure for my steam generator?

Are Full-Fit and FRP Elements Interchangeable?

Is it possible to separate air with RO Membranes?

Using Nanofiltration for Waste Water

How do I calculate Microfiltration Membrane area?


What are the differences of different types of membranes?  Are all membranes of the same type (e.g. TFC) from different manufacturers the same? (example: an oil filter by Toyota is different from that of Mitsubishi).

You are right. These are very similar in construction and performance. Like other products, the main difference is in the reputation and reliability of the manufacturer.  However, because there are different manufacturers, membranes do come in several end type configurations depending on the manufacturer.  When ordering vessels, you will need to specify what brand of membrane you plan on using so the appropriate end adapters can be built in.  When replacing membranes with a different brand, you should check with the salesperson to make sure the end configuration is compatible for direct replacement.  If not, you can usually purchase an end adapter for a reasonably low price.

I am using RO Water for our La Marzocco espresso machine. Is it possible that the water may be too pure to allow the electric steam generator level controller to operate successfully?

Pure water will not conduct electricity.  For this reason if your steam generator level controller operates by measuring electrical currents, the water may be too pure to allow it to operate successfully.  We recommend using a Nanofiltration Element instead of RO, which will remove only 80% of the Ions, compared to 99% by RO.

I have been using Full Fit Elements in my system.  I just changed the elements and am now using BW304040 which is a non-full fit element with a fiber glass cover. What kind of problems should I expect with the performance of the equipment?

There should be no problems.  These membranes are completely compatible.

I wonder if it would be possible to separate air with your membranes? Iím looking for a way to separate oxygen from air. What I understand, if concentrations and flow rates are moderate, a membrane-system is the best system to do that with.

Our membranes will not work for air.  They are good for liquids only.

1.Can we use the nanofiltration system for reduce COD (in treated water from leachate treatment plant) from 300 mg/l to 100 mg/l? 2. Does nanofiltration need the sand filter and activated carbon for pretreatment? 3. What is the good characteristic of feed water for nanofiltration?

Nanofiltration performance on waste waters is difficult to predict. Only sure way is to run a pilot test with one membrane.

I have seen RO systems with CTA and TFC membranes. The TFC units are higher in price. Are they necessarily better that the CTA? I want a small unit under the counter, about 10 GPD

The CTA membranes are chlorine tolerant whereas TFC membranes are not. The two systems should be very similar for your use.

What is the difference with Tap Water Membranes and Brackish water Membranes?

There is no difference in the membrane material. Brackish water membranes have an outer shell of fiberglass whereas Tap water have a tape wrap. The construction allows Brackish water membranes to be operated at higher pressures required to treat brackish water.

I would like to get information about how to calculate the microfiltration membranes area knowing the characteristics of the water and the feed flow.

Unfortunately, it is not that simple. You will need to do a pilot test to determine the design criteria for each feed water source

Are Nano Filtration membranes suitable for removal of Flouride?

No, you will need an RO membrane.


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