Keep your cat’s water clean and fresh with these Maarku replacement filters! This pack includes four filters, each with a round notch design that fits many stainless steel and stone cat fountains (check your model before buying). The filters use a multi-layer system: a plastic shell, cotton layer, activated carbon, and ion exchange resin to trap hair, heavy metals, and other impurities. Before first use, soak the filter in water for 2 minutes and rinse it to remove any carbon dust. After that, just rinse it during regular water changes and replace it every 2–4 weeks (depending on how many pets use the fountain). Your furry friend will appreciate the better-tasting water, and you’ll love the easy maintenance. Keep the fountain running smoothly and give your pet the hydration they deserve!