I only have a 13 gal. tank, so usually just pick up water from the lfs. For the first time, I measured the phosphates with my Hanna Checker and it came up with 0.02. I expected it to be 0. Are there phosphates in freshly mixed water or might my checker be wrong?
(the checker is only for saltwater, so I can't use rodi to test it.)
(the checker is only for saltwater, so I can't use rodi to test it.)