Built-in double filtration, the safe filter has an excellent effect on refreshing water, making your pets healthier. With strong adsorption function, activated carbon removes impurities and odors, allowing your pets to enjoy drinking water. PP cotton filters the coarsest debris such as hair and water deposits. Efficient and durable, 1 filter lasts you for 2 to 3 weeks, but with the aim of better allowing your pets to drink clean water. It is recommended to clean it in about 2 weeks, which can purify the water better and make the water more refreshing, providing good-tasting water for your dog or cat. Simple operation: this filter in ceramic is easy to install on the Safe fountain. Please note that rinse the filter with water before use, then you can clean the fine toner produced during transportation to make it clean and delicious, so that your pet falls in love with drinking water. High precision: this filter offers the best water quality for your dogs and cats thanks to its unique design. The activated carbon filter absorbs impurities, keeping your fountain clean and new. No need to clean the fountain frequently, saving time and water. Wide Compatibility: The set includes 8 ceramic cat water fountain filters, which only fit for PetSafe Drinkwell fountains, Avalon, Pagoda, Seascape, Sedona and 8 gallon Pet Fountains.