Xiaomi Smart Pet Fountain 2 Filter ensures clean, fresh water for your pet with an advanced four-stage filtration system. It combines high-density PP cotton to trap hair and debris, activated carbon to remove odors, and ion-exchange resin to reduce calcium and magnesium ions for softer water. A bacteriostatic coating helps inhibit bacterial growth, keeping water safer for longer. The filter works with the Mi Home / Xiaomi Home app, which sends smart reminders for timely replacement. Each pack includes three filters, designed for the Xiaomi Smart Pet Fountain 2.