It works hard to keep terrariums clean. Each filter comes with a replaceable carbon cartridge that removes odor, waste, and debris from water. Also included are suction cups and hanging clips that make installation quick and easy. A protective grate is in place to prevent the animal from entering the filter. Replacement cartridges for this filter are sold separately. Medium carbon cartridge included Protective grate prevents animal from entering the filter Patented power filtration Easy installation Fits terrarium size up to: 40 Gallons