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I have no color on the salifert so 0. And in the Hannah checker I score 2 which you then do an equation that puts me at .007
What in earth are you taking about? My Hannah checker just reads something like 0.02 or 0.00 which is the measured phosphate level. What kind of Hannah checker are you using?
The equation is used on the alkalinity tester, not phosphates
He is using the HI 736 Checker Phosphorus Ultra Low Range Tester, which the measurement unit is ppb.
As his result is 2ppb, that is around 0.0061ppm after the maths.
[h=2][/h]


