Salifert Potassium Test Kit The Salifert Potassium Test Kit is a reef aquarium test kit for measuring potassium levels in marine water, helping hobbyists monitor a trace element associated with coral colour and seawater balance. Potassium Testing for Reef Trace Element Control Natural seawater potassium is approximately 400 ppm. In reef aquariums, low potassium has been associated by many aquarists with reduced coral colour, making testing useful when potassium supplementation is being considered or adjusted. Salifert Potassium Test Kit Features Measures potassium in marine aquarium water. Test can be performed in approximately 90 seconds. Titration-style test with a sharp yellow-to-blue colour change. Useful when monitoring potassium supplementation or coral colour concerns. Natural seawater potassium concentration is approximately 400 ppm. Sufficient for approximately 40 tests. Designed for reef and marine aquarium use. Reef Supplementation Notes Do not dose potassium blindly. Test first, compare results with the salt mix and supplementation method being used, and make any corrections gradually. Potassium should be considered part of a broader reef chemistry plan rather than adjusted in isolation. Directions Follow the current instructions included with the kit. Use clean syringes and vials, read the yellow-to-blue endpoint carefully and record results before making supplementation changes. Keep reagents sealed and store the kit in a dry place.