About this item Qzbhct Upgraded Sponge Foam Filters Suitable for: Compatible with 2.5 L 84 oz Stainless Steel Pet Drinking Fountain Advantage: The Replacement Foam Pre-Filters trap any large debris and hair in the water, before they reach the pump providing cleaner water to your pet Features: Maintain the fountain’s flow rate, protects the pump and helps extend the life of your fountain Easy to replace: Can be quickly change the filters, capture debris and filter water to keep it clean and fresh for your pet. Suggestion: Change every 2-4 weeks depending on usage