Package Description: W03 Replacement cartridge for drinking fountains, 6 pieces per box, each piece of cartridge is individually encapsulated, dustproof and moisture-proof to ensure hygiene and prolong the preservation time, and more peace of mind as you use it Cleaning Guide: We recommend that you clean your water dispenser once a week and change the filter cartridge once a monthMaterial Filtration: adopts a multilayer high-efficiency filtration system, which can effectively intercept impurities and hair, soften the water, remove the odor, and retain the minerals, so that pets can drink purer and sweeter-tasting water Usage Guidelines: Soak the cartridge in water for 5 minutes for the first time of use and rinse to activate the filtering performance. and rinse to activate the filtration performance. It is recommended to replace the cartridge every 2 weeks (can be shortened to 7-10 days for families with many pets or in areas with hard water) to maintain the best filtration effect Tips: If your pet drinks a large amount of water or the water quality is poor, you can increase the replacement frequency to ensure the health of drinking water IMIPAW Cat Water Fountain Filter (6 Pieces), Replacement Cartridge for Cat Dispenser, Clean Filtration, Low Noise Pet Water Dispenser W03 Replacement Cartridge