Dego Red Posted October 11, 2010 Share Posted October 11, 2010 For as long as I've been in this hobby, I've never been able to keep SPS from browning, not one. After covering every base, phosphate had to be the culprit. Determined to find the source this time, I started testing everything. A few things just don't add up. I've always used Glacier RO water from Albertsons since its 1mi away and I only have a 35g system. TDS has measures 2-3, so I foolishly assumed that the PO4 readings must be lower than tap...right? Well here's what I got tonight: RO TDS: 2 RO TDS immediately after transferring to my ATO reservoir: 11 (say what?!) RO PO4 reading: Somewhere between 0.1-0.2, needs to be checked by a photometer Tap TDS: 57 Tap PO4: Between 0-0.1, but roughly half of the RO compared side-by-side My reservoir was cleaned the same way as my transfer buckets before the test - vinegar and tap - and never gets anything but RO. Can anyone explain these numbers or seen something similar?? I'm about ready to start conditioning my tap water until I can get my hands on an RODI unit in the hopes I get better results. Quote Link to comment Share on other sites More sharing options...
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