The Hydra D.I Series is a pre-assembled cartridge system that provides deionized water using a staged filtration process. Water purification is provided using a 3-step process. Stage (1) removes particles greater than 5 micron, chlorine, and organics. Stages (2 & 3) are mixed bed deionizers designed to remove all dissolved minerals. The Hydra D.I. series includes all cartridges and resistivity light for a total turnkey system.