Perfect Compatibility These water fountain are designed to work with Oneisall PWF 001 2L stainless steel pet water dispenser Each set includes 18 replacement, 18 pre filter sponges and 18 pump filter sponges for continuous use Recommended Replacement Schedule For optimal execution, replace the water fountain filter every 2 3 weeks Homes with multiple pets may require more regular and filter replacements to maintain clean drinking water Advanced Filtration Technology filter consists of fabric layer, purifying carbon and exchange resin to help minimize unwanted particles and maintain water Pre filter sponge traps pet hair while pump sponge prevents debris from entering the water motor Cost Effective Our well crafted fountain excellent durability with robust construction and extended service time, providing safe water for your pets at fair Easy Preparation Guide Before initial use, soak the pet water fountain filter in water for 5 minutes and rinse with clean water briefly to carbon remainder in your pet ' s water