... Ingredient: CaCl2:74%, 77%, 90%, 94% Appearance:Powder/ Flake/Pellet Hardness IncreaserChemical: Calcium ChlorideIngredient: CaCl2:74% / 77% / 90% / 94 ... Flake/PelletSynonym: Cal Plus,Water hardness Features:Hardness Increaser is used to raise the calcium hardness level in the pool to ... Stops staining and etching of pool surfaces caused by low hardness levels. About us Qingdao Hot Chemicals Co., Ltd. ...