You're right Torx, 0 indicated TDS does not = 0ppm
Denny, I'm assuming that you're saying the amount of Phosphate that might be getting through is a small amount compared to other sources... Such as overfeeding & fish poop I'm assuming? My main system is 50gal total volume, in a 35gal shallow reef display with open top. I put about 5gal of makeup water through it a week. Office tank is 8gal nano, with solid lid, maybe 1 gal a month? Both are what I would consider lightly stocked.
Stircrazy, thanks for confirming
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