I have the elos test kit and It's by far the best phosphate kit out there minus the Hanna checkers digital read out ( come on Santa)
Never had any issues
Make sure to look down the tube with lid off the color is VERY faint tint of blue it doesn't change like a nitrate test does
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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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