Calcium Chloride Ingredient: CaCl2:74%, 77%, 90%, 94% Appearance: Flake/Pellet Synonym: Cal Plus, packing:25kg/bag Hardness IncreaserChemical: Calcium ChlorideSynonym: Cal ... . Prevents water from becoming corrosive and damaging pool’s plumbing and heater. Stops staining and etching of pool surfaces caused by ... 2lb),2kg (or 5lb),3kg,4kg (or 10lb),8kg and 10kg of Pillow Bags, Doy Packs,Gusseted Bags.0. ...