Pet Safety: Compatible with 2L upgraded Pet Fountain. Made from top quality cotton, premium ion exchange resin and activated carbon, it can remove chlorine, impurities and odors, catch hair and debris, and soften hard tap water to provide better quality water for Cats and Dogs. Keep Water Lasting Fresh: Exchange resin remove magnesium and calcium in water, and it is made into pet-friendly water (soft water) whose hardness is lowered; High performance activated carbon absorbs odor Easy To Use: Rinse the filter with water thoroughly before use, and replace it regularly (depending on the frequency of use). Suggest: 1.Replacing Charcoal filters every 4 weeks to keep the water clean. 2.Replace more frequently if multiple pets using the fountain, rinse filter with water thoroughly before use. 3.A small amount of carbon dust may be released for the life of filter which is not harmful to your pet. Colour: white Material: Non-woven fabric + activated carbon Package Contents: 20 x Activated Carbon Filter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.