General description 8-pack of replacement filters designed for drinking fountains and cat drinking fountains. Each filter is individually wrapped for hygiene and cleanliness, providing enhanced protection for your pet. Technical specifications Type: Triple-effect filter Materials: Non-woven fabrics, activated carbon, natural resins Function: Effectively purifies water Usage Soak the cat fountain filter thoroughly in water before use. Carefully connect the soaked filter to the water dispenser. Replace the filter every 1-2 weeks in summer and every 2-4 weeks in winter to ensure clean water.