Tomxcute Official Cat Water Fountain Filters for 108oz/3.2L and 135oz/4.0L Adjustable Water Flow Cat Water Fountain, Ultra-Quiet Cat Water Fountain 16 Packs Filters & 8 Sponges Foam FiltersCompatible with Multiple Models Compatible with our 108oz 3. 2L and 4. 0L 135oz TOMXCUTE Stainless Steel Cat Water FountainMore 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 8 sponges