[Compatibility]: Cat Water Fountain Filters are compatible with for Ultra Silent Cat Fountain 67oz/2L with LED Night Light-Please check the size and model carefully before purchasing; [Multi-Filtration System]: this filter is composed of double-density filter, cation exchange resin and coconut activated carbon. high-quality materials, every drop of water is fresh and living water, so that your pets love to drink water; [Active Filtration]: our filter replacement stops hair and debris, remove heavy metal elements, so that your pets drinking water is more than clean, improve the softening of water quality, and effectively prevent urinary tract diseases in pets. Make your petand#39; s life happier; [Friendly Reminder]: Please soak the filter in water for 5 minutes and rinse it thoroughly under running water before use. Change the filter every 2-4 weeks to the clean of drinking water; Material: Plastic + cotton colour: White+black Package Contents: 4 x Filter Elements 4 x U-Shaped Filter Cotton 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.