Electrodeionization (EDI) is a continuous polishing technology used after RO to produce very low conductivity water without acid/caustic regeneration. It combines ion-exchange media with an electric field to remove remaining ions.
Where EDI is used
Boiler feed, process demin water, industrial DM water systems, and high-purity utilities where stable low conductivity is required.
What PMC supplies
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EDI skid systems (modules, piping, instruments, control panel)
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RO–EDI interface design support (feed window protection philosophy)
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Monitoring: conductivity/resistivity, flow, pressure, temperature, alarms
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Commissioning support (project-dependent)
Critical inputs
Required product flow, target conductivity/resistivity, RO permeate analysis, temperature, operating hours, redundancy (duty/standby), power supply.