Are you using a Hannah “Phosphorus ULR?” That is the one that reads in parts per billion. The phosphate ULR reads in parts per million.
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74ppb = 0.074ppmHello everyone I retested with another checker (ULR) and we got 71ppb. I retested with mine with the same cuvette making sure we did it on the same glass cuvette and got 74ppb. Very very light blue almost unrecognizable compared to a few months back when it was dark royal blue.
The reason this is important, there is a conversion you must do from phosphorus to phosphate. In your case 74ppb (phosphorus) would convert to 0.218 ppm (phosphate). The link below is to a handy conversion table from Hannah.Are you using a Hannah “Phosphorus ULR?” That is the one that reads in parts per billion. The phosphate ULR reads in parts per million.
Forgot all about it. Probably since I use ULR phosphate checker.The reason this is important, there is a conversion you must do from phosphorus to phosphate. In your case 74ppb (phosphorus) would convert to 0.218 ppm (phosphate).