【Perfect Compatibility】： Compatible with Cat Mate 335 SPRUE & Dog Mate Pet Mate. 【Quality Drinking Water】： The filter is made of fine activated carbon polymer filter fiber, which can eliminate bad taste and odor, keeping the water fresh from pet fountains，Let your pet be able to replenish the cleanest fresh water every day. 【Multi-layer Filtration】： The efficient layered filtration system can remove chlorine, sediment and volatile organic compounds, and can effectively prevent the pump from clogging and extend the service life of the cat/dog fountain. 【Cycle used】： In order to keep your pets with the cleanest fresh water at all times, it is recommended to change the filter once every two weeks.There are 12 in each package, enough for you to use for six months. Features: Item Name: Pet Water Fountain Filter Material: Plastic + Cotton + Activated Carbon Color: Blue Single Size: 10.9 * 5.4cm Package Weight: 289g Package Size: 19 * 5 * 13cm Package List: 12 * Filter