[Compatible] This cat water fountain filter is compatible with a variety of cat fountains, before buying please confirm whether it is compatible with your cat fountain to avoid purchasing errors. [Triple Filtration System] The carbon filter of cat fountain helps to remove odor, soften water, and improve taste and quality of your pet's drinking water. Meanwhile, the filter sponge captures pet hair, dirt, and food particles, providing your pet with pure and healthy water. [Material] Made of eco-friendly materials,the pet water fountain filters help the water quality and provide healthy and pure water to protect your pet's health. [Filter] The cat fountain filter helps purify water and bad odors, while pre-filter sponges blocks out any hair, dust or food debris. [Clean] Before use, soak and flush cat water fountain filter with clean water,clean filter every time you change water of cat fountain, and change cat drinking fountain filter every 2-4 weeks. Color:White Material:Cotton Package Contents: 6 * filter elements 6 * filter cotton Only above package content, other products are not included. Note: Light reflection and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.