How much water have you made? I have read that the pre and carbon filters should be changed at 6 months as bacteria can grow in them, but ro membrane can go a few years. I usually change my di resin when it moves from 0. Is you tds meter calibrated?
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360 gallon sps reef, 180 gal sump, bubble king supermarine 300, 4xmp40Wes, 2 x 6215 tunze waveboxes, 4 ghl mitras
360 Reef Tank
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