Our online calculator will help you calculate the content of magnesium and calcium in the aquarium.
Permanent hardness of water (denoted as GH) and due to its content of sulfate, chloride and some other salts of calcium and magnesium when heated, they precipitate does not fall out, it is the non-carbonate hardness is critical and affects the water's suitability for life of animals and plants in the aquarium.
The division of water hardness:
0-4 GH – very soft water;
4-8 GH soft water;
8-12 GH – water of medium hardness;
12-18 GH – water of moderate hardness;
18-30 GH hard water.
Calcium is a substance necessary to create and shape the growth of aquatic plants in particular corals.
With a minimum calcium deficiency in plants leaves begin to turn yellow, curl and unable to stop its growth.