12 Pack premium arc-shaped charcoal water filter compatible with NPET WF050, WF100 and WF210 pet drinking water fountain. Food grade activated carbon removes impurities and improve taste from water, keeping it fresh; Spongy layers prevents hair, debris getting into the water pump. Incorporates a multi-stage filtration process, including activated carbon and mechanical filtration, to ensure optimal water purity and clarity. Offers hassle-free maintenance with easy-to-replace filter cartridges, allowing you to keep your pet's water fountain functioning at its best with minimal effort. Dimension: 4.5" x 2.2" x 0.7". Suggest regularly replacing the filter to ensure optimal performance of the water fountain, maintaining a clean and hygienic environment for your pet's hydration needs.