Compatibility: Compatible with Tomxcute 3.2L water fountains, Giothon 67oz/2L stainless steel pet water fountains, Petlibro 67oz/2L stainless steel pet water fountains, SOOFPET 3.2L/108oz water fountains, DOOOB 3.2L/108oz water fountains, and WoPET, Bento, 108oz 3.2L and 67oz/2L cat water fountains (stainless steel). Product Dimensions: Filter cartridge: 7.5 x 4.5 cm, Pre-filter: Outer diameter: 8.5 cm, Inner diameter: 5.8 cm. 30% increased raw material content: We have increased the raw material content by 30% in each filter cartridge, providing your pet with a more comprehensive filtration experience and healthier drinking water. Four-layer filtration: The pet water fountain filter cartridges are made of high-density cotton and non-woven fabric, ebony sponge, and activated carbon. This filter media is soft and reliable, providing superior water purification for your pet. The filter sponge filters out hair, dirt, bacteria, and odors, resulting in softer water and healthier drinking water for your pet. Note: Rinse the filter sponge before use. To prevent activated carbon from falling into the water, soak for five minutes. It is recommended to replace the filter sponge every two weeks in summer and every three weeks in winter. Easy installation: The pet water fountain filter cartridges are easy to remove for convenient cleaning of the water pump and replacement of the sponge filter cartridge. Ample set: You will receive 12 filter cartridges and 12 pre-filter cartridges; one purchase lasts for approximately 6 months. The dimensions of the replacement filter cartridge are 7.5*4.5 cm. The inner diameter of the sponge is 5.8 cm; please measure the dimensions of your filter cartridge housing before ordering. Replacement filter cartridges effectively isolate impurities such as hair in the water, ensuring safe operation of the water fountain, improving water quality, and protecting your pet's safety. Replace the activated carbon filter cartridge every four weeks. Replace the sponge filter cartridge every two months. Soak the filter cartridge in a clean container for 5 minutes.