Mixed bed, dual bed, and EDI systems producing ultra-pure process water. From 200k ohm general process water to 18 megaohm pharmaceutical and semiconductor grade.
Deionization removes dissolved ionic species from water using cation and anion exchange resins. Unlike RO systems that reject a percentage of ions and waste a portion of feed water, DI systems exchange ions stoichiometrically — producing very high purity water with near-zero TDS. The tradeoff is regeneration chemical consumption and resin replacement costs.
Dual bed systems use separate cation and anion vessels in series. They're more efficient to regenerate and typically achieve ~200k ohm-cm water quality — suitable for most process water and rinsing applications. Mixed bed systems intimately blend cation and anion resin in a single vessel, achieving up to 18 megaohm-cm (near-theoretical maximum purity). They're required for semiconductor, pharmaceutical, and power generation applications.
Electrodeionization (EDI) combines ion exchange membranes with an electrical current to continuously regenerate the resin without acid or caustic chemicals. EDI systems produce 10–18 megaohm water 24/7 with no regeneration downtime, making them the preferred choice for continuous-process pharmaceutical and microelectronics manufacturing.