Colombo Magnesium Test (marine)
Is also suitable for the Mastertronic, then select the Giesemann test (Colombo is the same as the Giesemann test), 2 test sets are needed to fill the Mastertronic reagent bottles up to 20ml.
The Colombo Marine Magnesium test accurately determines the magnesium content in the seawater, is easy to use and gives a reliable result.
Magnesium is very important in the water to maintain a sufficiently high calcium concentration (Ca) and hardness (kH).
A magnesium concentration that is too low is disastrous for the calcium concentration and hardness in an aquarium.
The best magnesium content is between 1300 and 1400, but this again depends on the calcium and KH value.