When testing NO3 the results are clear with a metal grey residue, when mixed it separates and clumps back. See pic
The PO4 appears to work and says I have 0.01. Would you agree with the That from the pic?
What can cause the metal grey, does it mean I have no nitrates, too high or just a bad test?
The PO4 appears to work and says I have 0.01. Would you agree with the That from the pic?
What can cause the metal grey, does it mean I have no nitrates, too high or just a bad test?