The Salifert Magnesium Test Kit use to determine the Magnesium content in seawater exactly and easily.
Salifert Magnesium Test Kit is very straightforward and does not suffer from calcium and strontium interferences when within certain bounds. It measures in sufficient accurate steps of 30 mg/L with a sharp color change.
Natural sea water has a magnesium concentration of approx. 1300 - 1500 mg/l. The concentration varies with salinity. Too low magnesium concentration makes maintaining correct calcium and alkalinity concentration difficult.