Dimensions: 131x39x131mm color: White Package Contents: 4 pieces Fully Compatible: This flower fountain filter is fully compatible with pet fountains Improve water quality: Water quality can be reduced by three 3 filtration methods. An outer polyester layer on each filter traps hair and dirt, and three-step filtration ensures water quality and improves your cat's freshwater taste Ease of use: Rinse the filter thoroughly with water before use, so it can be easily installed into the fountain Keep your pet healthy Each filter is composed of cotton layer, activated carbon and ion exchange resin, they can filter hair, heavy metals, improve the taste of water, let pets drink clean and fresh water all day long, help increase water consumption,reduce risk of urinary tract infection CAT Water Filter Replacement Frequency: Recommended to replace pet fountain filter every 2-4 weeks to maintain water quality, if multiple pets are using the fountain, the pet fountain carbon filter needs to be replaced more frequently