Compatible with multiple models: Compatible with for our 108oz/3.2L and 67oz/2L Stainless Steel Cat Water Fountain(More compatible models: PLWF003)Replace Regularly: Pet water fountain need to replace the carbon filter every 4 weeks.(The hot weather breeds mosquitoes, please replace the carbon filter once 2 weeks), and replace the foam filter every two months to keep the water fresh.Quantity specification: Set of 8 filters and 8 sponges compatible, easy replacement, bringing more protection to your pet.Three-layer filtration: First Filter,Block Hair and Debris,Middle Filter,Remove Residual Heavy Metals,Third Filter,Healthier, High-quality Flowing Water,Allow pets to drink clean, fresh water throughout the day.Matters needing attention: Soak the lter in a clean bowl for 5 minutes Notes, The lter must be fully soaked before the fountain is turned on; Otherwise, the water may not diuse through the lter and cause overow,Do not soak the lter in the fountain tank to avoid dust on the surface.Material:spongecolour:white + blackPackage Contents:8 * filter elements8 * filter spongesOnly 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.