Salifert Potassium Test Kit.
Potassium concentration in natural seawater is approximately 400 ppm. Many aquarists have reported that a low potassium value reduces colors in corals. This can be corrected by increasing the potassium value to the normal natural concentration. Now you can accurately measure this value with the new Salifert Potassium Reef Test kits.
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Best Potassium test kit Review by Andre
I have tried other test kits for potassium but this one is the easiest to use and to interpret the results of. (Posted on 10/29/2014)