A membrane flush is the only way you can prevent this. I know of one RO for residiential applications that has it. Everytime the tank fills up, 140-200ml of RO water flushes the membrane. So the water can sit there for extended periods of time and the creep stays away.
I don't think your can be modified to do that. Stagnant water is a major reason for membrane failure.
Since the water to the fridge (as well as the faucet) comes from the tank, why does the TDS go up for that only? How long has the fridge been hooked up to the RO?
Andy Christensen, CWS-II
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