?? 【Wide Compatibility】 - Replacement Filters compatible with 1.6L-2.4L Parner fountain and others of the same size. Size: outside diameter 12.6CM, inside diameter 3.5CM. Note: Not suitable for Catit Fountain. Please check the size of the water dispenser card slot before purchasing. suitable for Catit Fountain. Please check the size of the water dispenser card slot before purchasing. ?? 【Triple Action Filter】 - 1. High density PP cotton to isolate fur and debris; 2.Resin can soften water and reduce the likelihood of lithiasis; 3. Activated carbon removes bad odors in the water. All filter materials are SGS certified, non-toxic and harmless, provide only fresh water to the cat. ?? 【Recommendations】 - Before use rinse Replacement Filters for 3-5 minutes to remove carbon dust . It is recommended to replace them regularly every 1-2 weeks (depending on the frequency of use). Recommend to Change the Water and Clean Cat Fountain regularly every 1-3 days. Please place the flat face up to