Ion filter cotton is made of ion exchange resin and high-performance activated carbon. Ion exchange resin can soften the hardness of magnesium and calcium in tap water, forming water quality suitable for pets. Pure natural high-performance activated carbon can Adsorbs the smell and residue of ammonia in tap water, and the non-woven layer effectively removes dust and impurities, providing clean water for pets, thereby maintaining the health of the dog's urinary tract. 2 tablets, 1 tablet replaced at a time, recommended to be replaced monthly Once.