【Perfect Compatibility】Compatible with HAPUP water dispenser for cats and dogs. Encourage your pet to drink plenty of water and stay healthy. 【Triple Filtration System】Each cat water dispenser filter is made of porous filter cotton with a layer of high density cotton, high quality activated carbon and ion exchange resin. Cotton layer: filters the hair,sediments and debris. Activated carbon: Eliminates bacteria and chlorine odors. Ion exchange resin: softens tap water and helps prevent urinary tract diseases. It keeps your cat’s drinking water clean and fresh. [Premium Quality] The cat water dispenser replacement filters are made of high quality materials, non-toxic, visible, easy to use and easy to clean. Plus, the black and white design makes it easy to knowwhen to clean and replace the filter. Filters provide your pet with cleaner water and reduce the risk of disease. [Replacement cycle] To prevent charcoal dust from escaping, please rinse the cat spring filter thoroughly under