Clearflow EDI-ST 40

Continuous deionisation with no regenerant chemicals at all. The stack holds mixed-bed resin permanently regenerated by the applied field, which means no acid, no caustic and no regeneration waste to neutralise.

What it is designed to do

The Clearflow EDI-ST 40 is a standard Clearflow configuration rated at 4 m³/h of permeate at 95 % system recovery, which is 96 m³ over a continuous day. The published envelope assumes 25 °C, a clean membrane and the design feed analysis; every project is re-projected against the water you actually have before a price is issued.

• Feed envelope — up to 30 mg/L TDS, SDI15 below 1, turbidity below 0.05 NTU
• Membrane hardware — 4 elements across 4 vessels, 30 m² of active area
• Energy — 0.16 kWh/m³ of product at design conditions, 5.5 kW installed motor load
• Delivery — 1.8 × 0.9 × 2.0 m, 480 kg dry, 8–10 weeks ex works

How the array is put together

The array is arranged as single bank, 4 modules in parallel on a common rectifier. Element type is EDI module, 1.0 m³/h dilute flow each, running on heterogeneous ion-exchange membranes with permanently regenerated mixed-bed resin. Design flux is held at 133.3 LMH so the concentrate velocity through the last element stays inside the manufacturer envelope at design recovery — the single most reliable predictor of how long the membranes will last.

Operating conditions

Cleaning, control and materials

Chemical free in service; periodic hot water sanitisation to 80 °C. Control is by Industrial PLC with product resistivity interlock and divert valve. The wetted specification is 316L sanitary tubing, polypropylene module bodies, PVDF valves. Pressurisation is by sanitary 316L feed booster; not applicable.