[Compatible with multiple models]Compatible with 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 16 filters and 16 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: composite materials colour: As shown Package Contents: 16 x filter elements 16 x filter cotton Only the above package content, other products are not included. Note: Light reflection 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.