[6 Pack Cat Fountain Filters]You'll get 6 pack activated carbon water fountain filters.[Food Grade Water Fountain Filter] All filters are food grade Superior cotton layer we use is more durable and longer-lasting than the average. It can stay intact after tens of days' wear and tear underwater, instead of coming apart when to replace it. Natural coconut shell activated carbon tightly sealed inside won't penetrate through the pp cotton, no carbon particles evident in water.[How to Use]Before use, wash the completely new pet water fountain filter thoroughly under rinsing water to remove the excessive and scattered dust from the charcoal. To keep water clean and sanitary, please replace the charcoal filter every 20-30 days in most cases, if you have more pets, or your pets are fond of playing with the drinking water, change the cat water filter proceeding from a real situation.Replacement Filters for Battery Operated Cat Water Fountain KKFS23/KKFS24/KKFS34size:15cmMaterial:cotton+plasticcolour:WhitePackage Contents:6 x filter elementsOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.