Fresh Water in Every Sip: Each drop of water undergoes multi-layered filtration: activated carbon for odor removal, ion exchange resin for softening and removing heavy metals, non-woven fabric for capturing hair and impurities, and high-density pump sponge for eliminating fine particles.This ensures a year-round supply of fresh, healthy water for your pet Compatible Fountain: The cat water fountain filters are compatible with FEELNEEDY cat water fountain FN-W08L and FN-W06 What's in the Box: Include 6 packs of replacement filters, 6 packs of pump sponges Frequency of Replacement: We recommend replacing the filter every 2 weeks for pet’s health Using Tips: Soak the filter for 5 minutes and thoroughly rinse it 5 seconds before use 1 filter housing + 6 packs of replacement filters + 6 pieces of replacement sponge for the water pump.