Deionizing filter cartridge is used as a final TDS reduction stage downstream of reverse osmosis purification systems. DI is used in aquarium water and laboratories. Last stage replacement cartridge for HydroSense-0500DI and Aqua-Titan-0400DI. Dimensions: 2.5" W X 10" L Filtration Media: DI Mixbed Resin Flow Rate: 0.5 gpm Fitting Size: 1/4" quick connect Service Life: 6 Months/230 Grains Additional Details ------------------------------ Product description: Deionizing filter cartridge is used as a final TDS reduction stage downstream of reverse osmosis purification systems. DI is used in aquarium water and laboratories. Last stage replacement cartridge for HydroSense-0500DI and Aqua-Titan-0400DI. Dimensions: 2.5" W X 10" L Filtration Media: DI Mixbed Resin Flow Rate: 0.5 gpm Fitting Size: 1/4" quick connect Service Life: 6 Months/230 Grains