My 2 cents is that the phosphorous checked isn't worth the plastic it's made from. Unless you're using analytical lab methods (which include regularly washing your cuvettes in hydrochloric acid), its results are no more reliable than looking out your window and trying to guess the days temperature.
You're way better off looking at cues your tank is giving you, such as the rate film algae grows to get a sense of what's going on with phosphate in your system
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