12/24 PCS Replacement Foam Filter Petsafe Drinkwell Stainless Steel Pet FountainThe Foam Filter stops debris such as dirt and hair from reaching the pump and cycling through the fountain. Replace every 4 8 weeks to help keep your fountain pumping along. Note: this is not the genuine Drinkwell product. Package includes: 12 24 x filter foam Notes: Due to the light and screen setting difference, the item's colour may be slightly difference from the pictures. Please allow slight dimension difference due to difference manual