do you mean phosephates(PO4) or PH? PO4 is 0 and PH is 8 ppm. and ideally from what I read PO4 should be at 0.
PO4!
(Although zero of either one would be really bad!!!)
Curious if you could tell me where you read that about phosphates?
Phosphate and nitrate are both major nutrients for ALL LIFE.
P is used in DNA, in photosynthesis, in cellular repair, for growth, for reproduction, etc, etc.