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#5
06-21-2003, 04:20 AM
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You can check your membrane by measuring the output after the RO and before the DI with a TDS meter. When it falls below 95% removal of the TDS in tap water, it is time to replace the membrane. We have done this once in two years, but we run a LOT of water.
Replacing cartridges also significantly depends on how much water you are running through the unit.... 
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