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Nopox is just carbon dosing. Cut the dose in half and see if the no3 and po4 stabilize above zero, like no3 < 10 and po4 < 0.1, that's sufficient.
Po4 binds to rock and sand so as it is removed from the water, it leaches out of the rocks. Eventually you'll have removed it all.
Po4 binds to rock and sand so as it is removed from the water, it leaches out of the rocks. Eventually you'll have removed it all.