undetectable

  1. Gustavo89

    Undetectable Phosphates...what to do?

    Hello, ive been dealing with Undetectable Phosphates , normally i test with Hanna Checker. 1 month ago, i move the sand abprutly to test the next day and they were around 0.75 PPM, then checked again after 3 days they were around 0.20 ppm, then again until 0.00 PPM. So i guess they are...
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