Sediment cartridges are used to catch dirt, sand, mineral or metal particles. They are available in 20, 10, 5 or 1 micron sizes. Lower micron ratings mean smaller particle removal. We only carry 5 and 1 micron. Replace when the filter plugs up or reaches the suggested lifespan or purchase a reusable cartridge. These are all 10" tall cartridges for standard or jumbo canisters, except for the last option, which is a 5" cartridge.