Replacement filter for the cat fountain. Keep your cats drinking water fresh, clean and safe. Helping you take care of your cats’ health. Most filters on the market are made of activated carbon But these filters are made of coconut shells activated carbon, ion exchange resin, high density non-woven fabric. The water is deeply purified and safer. Features: Dual action filters: The ion exchange resin can soften the water and reduce the risk of lithiasis. Coir activated carbon can adsorb impurities and odor, keep water fresh and clean. The non-woven fabric can filter hair, sediment and debris in clean water. Nano Barrier Filter Small particles and other impurities. Compatible with: compatible with veken and other flower fountain of the same size. Size: 4.9 inch (length), 1.38 inch (inner diameter), 0.31 inch (0.31 inch). Keep pets healthy: bulk filter is more effective. The water quality can be eliminated by the 4 types of filtration. 4 stages of filtration can ensure water quality and