The product is colorless square crystal, ordinarily in white or white cavernous and honeycombed. It is easily soluble in water and the solution is subacid. It is mainly applied in the desiccant and used as the dehydrating agent for producing alcohol, ester, ether allyl resin. It can be also used for processing and deinking the waster paper. It is the raw material in producing calcium salt. The solution can be used as the flocculating agent in the industries such as sodium alginate and bean product.