AquaHouse Water Softener Pre-filter System Replacement Cartridge: AH-SED105BB-WS Suitable for removing rust and sediment particles from the water prior to a water softener, to help prevent sediment from clogging injectors within the softener. 5 Micron rated sediment filter. Replace filter as required - dependent upon usage and water quality AquaHouse replacement sediment filter code: AH-SED105BB-WS for AquaHouse Water Softener sediment pre-filter system (model AH-WSPRE) AquaHouse branded filter, Aquahouse is a registered trademark of Water Filter Man Ltd