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There are 2 basic types of membranes out there.
There is the CTA membrane which is chlorine tolerant, and the Then Film Membrane which is not.
Dow owns the patent on the TFC membrane. Commonly known as a FilmTec membrane. These are the membranes that are used in most residential applications. That is why they come with a carbon prefilter to take out the chlorine.
The CTA membranes as a gerneral rule do not have as high a rejection rate as TFC membranes.
Because Dow owns the patent, no matter who you buy from, if they use a TFC membrane they are all pretty much identical.
Some just mark them up more I guess.....
So look for the type of membrane that is being used in the RO unit and see if it is a TFC. More than likely it is a rebranded FilmTec. I am not %100 certain as to if Dow has sold menufacturing rights to this type of membrane. The last I checked, which was over a year ago, all TFC membranes were made by Dow.
HTH
Ant
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