Originally Posted by Dimdim
Its a brand new ro di
unit, and my api test for phosphate came up dark blue measuring like 10 ppm
! i did the test right from the ro di
outlet to my tankI did a test on my tank, almost 0 phosphates, tested the tap water, under .25. Tested newly mixed saltwater read .75 -.5 tested all again with the same results
API phosphate test is garbage and not worth the money due to how inaccurate it is. That is what you are experiencing if you have 0 tds
reading. If you don't have a tds
meter, I'd highly suggest one to go along with a better phosphate test. The Red Sea ones are supposed to be good, but I use the Hanna checkers. More money, but worth it as it will display a number rather than a color to figure out.