The Colombo Marine Magnesium test determines accurately the magnesium content in the water. Magnesium is very important in the water in order to maintain a sufficiently high calcium concentration and -hardheid. A too low magnesium concentration is in fact detrimental for the calcium concentration and -hardheid in an aquarium. The best magnesium content is between 1300 and 1400, but this again depends on the calcium and KH-value.

The Colombo Marine Magnesium test is easy to use and gives a reliable result.