Water is a natural solvent, dissolving a little of everything it touches as it falls and flows on the surface of the earth. It picks up minerals found in nature such as iron, manganese and sulphur, as well as other contaminants produced by everyday activities of humanity. envirowater TECHNOLOGIES’ exclusive iron and sulphur water treatment designs work to treat water for the whole house. envirowater TECHNOLOGIES’ premium iron & sulphur filters remove iron and that nasty sulphur odor “rotten egg smell”.