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![]() I have a dual TDS meter, one shows after RO and before DI, and the other shows after DI. When the RO tds starts to go up, it tells me it is time to flush the membrane. My final RO/DI water is normally 0 or 1. When it goes up it is time to change DI. When flow slows down, it is time to change the sediment and carbon filters.
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