Wide Compatible-- 12 pcs independent packaged high quality activated charcoal cat fountain filters. The diameter of our cat filters is 12.5cm. SGS certify -- 1.Double layers of high quality cotton isolate fur and scrap; 2. Activated carbon absorb impurities, pigments and peculiar smell; 3. Ion exchange resin can soften water and reduce the likelihood of lithiasis. All the materials in the filter are SGS certified, non-toxic and non-hazardous, only to provide fresh water compatible with the cat. Easy to use-- 1. Thoroughly rinse the cat filter compatible with 3-5 minutes becompatible withe use, soak the filter element completely to remove charcoal dust. 2. Keep the flat surface up to ensure the best filtering effect 3.We recommend 1-2 weeks change. (depending on the quantity of pets and the frequency of use) 4. We recommend 3 days to clean Water Fountain and water change to ensure the clean of drinking water. 12 pcs Individually packed-- 12 pieces, each individually packed. Through separate packaging, each cat fountain filter can be easily stored and retained compatible with best filtration. Protect Pet Health-- Cat fountain filter helps reduce the risk of urinary tract infections; it is very important compatible with animal health.