đșăREPLACEMENT FILTERă The activated carbon cartridge measures 7.6*4.3cm. The inner diameter of the sponge is 6cm. Please measure the size of the filter housing before ordering or consult customer service to send a cat fountain model to check if it is suitable. đșăUNIVERSAL FILTER FOR CAT FOUNTAIN ăCATă Replacement filter for most stainless steel cat fountains. Compatible with various models of 3.2L/2L stainless steel cat fountains. đșăEFFECTIVE CAT FOUNTAIN FILTERă The replacement filter is made of natural cotton and contains activated carbon. The high-density cotton effectively separates hair and dust from the water, while the activated carbon absorbs odors and purifies the water to protect your pet's drinking water. đșăEASY TO USE FOUNTAIN FILTERăUSEă Rinse the filter with water before using it. Replace the activated carbon filter every four weeks. Replace the sponge filter every two months.