Give your pets round-the-clock access to clean, mineral-rich water with the Haliya 12-Pack Replacement Filters, created compatible with oneisall PW04 3.5L Stainless Steel Cat Fountain. Built for high-demand situations, this large pack is perfect for homes with multiple pets or those who prefer a bulk buy to reduce frequent ordering. Each filter includes four layers—non-woven fabric to trap hair and debris, activated charcoal to absorb odours, premium resin to reduce heavy metals, and maifan stone to balance the water’s pH. Designed for frequent replacements, this set supports optimal hydration and cleanliness in busy homes. For anyone looking to maintain a cat fountain used regularly by several pets, this high-capacity pack offers reliability and excellent value.