Get a TDS machine 25-35$ and it will tell you. The TDS should be zero coming from RO/DI not sure for straight RO also it will tell you when you need to change your filters
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Current tank---125 gallon mixed reef 60 gallon sump, Reef octopus nw200 skimmer, Rapid LEDs, Maxspec gyre, Mp10s, Fuge, Biweekly 20% WC, QT everything
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