What is it?
Dolomite (CaMg(CO3)2) is a natural rock used to add calcium magnesium carbonate to soil to provide calcium, magnesium and carbon to aid plant growth.
It is used in aquariums as a method to increase the general hardness (GH) of the water (and to a degree KH). Many plants, aquatic species require a level of hardness in the water to build their bones and external body parts. For example aquatic snails need a GH of at least 8-10d (142.9-178.6ppm) to stop their outer casing from dissolving into the water and killing the animal.
- When you add Dolomite to water, it reacts with any acids present and binds with free H+ ions to form Calcium bicarbonate, or Ca(HCO3)2 plus magnesium and thus reduces the count of free H+ ions which raises the pH of the water.
Using supplied in a powder or rock form, it can be added into aquariums where it will slowly dissolve.
Can be used as an alternative source of Lime.