Replacement Micron Cartridge for the Lifegard Aquatics Mechanical Filter Modules, Filters out the finest particles leaving your water looking crystal clear, Can be rinsed and reused, however upon the first signs of ripping or tearing, your cartridge should be replaced to continue effective micron filtration of your aquarium water, CL-29 20 Micron, Dimensions: 29"", SKU: RYLHC3027