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My RO/DI systems for water changes and ATO have TDS=0. I measured PO4 in RO/DI water and got .02 and .04 respectively. I know that measuring PO4 in RO/DI water is inaccurate, but are these acceptable levels? I am fighting a 0.16 PO4 lever with GFO, refugium, and 15% weekly water changes.