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RO membranes



How often do you have to change your membranes ?
How do you notice they are dead ?

I currrently higly suspect mine...(TFM36)
Produce twice less / day and seems to reject more then before.
It's 1.5 years old, protected by 2 big prefilters.
Tap water is ±850µS, eluate ±35µS
Is there a way to "revamp" them ? Even only for few weeks ?
It doesn't look possible to operate it 'reversed' :(




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