【Wide Compatibility】 Compatible with most 84oz/2.5L round stainless steel pet fountain on market (Attention: Please confirm the size of your cat fountain before purchasing) 【Healthy and Safe Material】This cat fountain filter is made of environmentally friendly materials, non-toxic and harmless, which will not affect the health of pets, you can use it with confidence 【Multi-layer Filtration System】 Composed of non-woven fabric, activated carbon and ion exchange resin. Effectively to filter hair, heavy metals and keep the water fresh and improve the taste of the water 【Easy To Use】Please soak the pet water fountain filter in water for 5-10 minutes before use to make the filter work best. Rinse the replacement filter with water thoroughly, then install the cat fountain filter into the cat drinking water fountain 【Package includes】 6 replacement filters and 2 Pre-Filter Sponges. According to your pet's drinking frequency and the number of pets using the fountain, please replace the filter and clean the sponge every 2 to 3 weeks Cat Water Fountain Filters