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Is TDS and ppm the right thing to be checking to determine when the R/o membrane needs to be replaced?

April 26, 2017checking determine membrane Needs right TDS thing

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Is TDS and ppm the right thing to be checking to determine when the R/o membrane needs to be replaced?

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– I’ve noticed that my salt mixing tank will build up a brownish residue over months on the sides and on the aeration stones, heater. I use Rubbermaid tubs for my R/O tanks and salt mixing tank. the r/o tanks never get this residue, but the salt tanks do, and the only thing different in the salt tank is that it is aerated, heated with a titanium heater, and has salt (instant ocean). Any ideas on what causes the brown residue slim? Is it harmful? It looks almost like a rust, but comes off easily via wiping.