Cats can get stinky, this is a charcoal based filter that assists to reduce all kind of odor from the cat litter in the house. A good product by Savic, for homes that have already installed the cat litters. This filter ensures an odor-free environment for all your guests and family members. The active charcoal filters are treated with oxygen and it ensures to open the tiny pores between various carbon atoms. This absorbs various gases and liquids. This is an easily replaceable product. The Savic Cat Toilet Home Filter is a must-have product for all litter box owners. This product does not substitute for litter box but acts as a peripheral to your cats and kittens litter boxes. For the best results, we advise you to replace the carbon filter on a monthly basis.