Data-sheet

Summary

Product identification

• Model: EDI-310
• Part Number: 10406238
• DOW™ EDI modules utilize a patented spiral wound design, integrating membrane and ion exchange resins within a high-strength fiberglass reinforced plastic (FRP) pressure vessel. These modules are designed to replace conventional mixed bed ion exchange for polishing reverse osmosis (RO) permeate, thereby eliminating the need for hazardous chemical storage and handling. They are capable of producing up to 18 megohm-cm product water for high purity and ultrapure industrial water applications.

Features

• Once-through concentrate flow path eliminates brine injection and recirculation, simplifying system designs.
• Distinct spiral design prevents internal and external leaks common with compression-style plate & frame stacks.
• Easy-to-clean, non-resin-filled concentrate chambers.
• Lightweight modules require no special lifting equipment, allowing for easy access and modular designs.
• Built-in sample port for dilute product water sampling.
• Cost-effective spiral wound DOW™ EDI modules allow system integrators to build systems with lower capital and operating costs compared to conventional mixed bed ion exchange.

Performance specifications

• Product Water Resistivity: ≥5 MΩ∙cm, ≥15 MΩ∙cm
• Total Exchangeable Anions (TEA): ≤ 25 ppm (CaCO₃), ≤ 8 ppm (CaCO₃)
• Note: Based on standard test solution; actual module performance depends on specific feed water conditions.

Mechanical / hydraulic

• Dilute & Product Water Connections: Dn 15 (PVC-U)
• Electrolyte Connection: Rc1/4 ″ (Nylon)
• Module Length: 35.9 In / 898 mm
• Base Diameter: 11.6 In / 290 mm
• Net Module Weight: 43 kg / 95 lbs

Operating limits

• Dilute Water Flow rate: 1.5 to 2.2 m³/h (6.6 to 10 gpm)
• Recovery Rate: up to 95%
• Inlet Temperature: 10 to 38ºC (50 to 100 ºF)
• Max. Inlet Pressure: 6.9 bar (100 psig)
• Max. Continuous Operating Pressure: 5.5 bar (80 psig)
• Dilute Pressure Drop: 1.5 to 2.5 bar (22 to 36 psig)
• Concentrate Outlet Pressure: 0.5 to 0.7 bar less than dilute pressure (7 to 10 psig less than dilute pressure)
• Electrolyte Flush: 40 to 60 l/h (0.18 to 0.26 gpm)

Feed water

• Based on RO Permeate:
  • Hardness: ≤ 0.5 ppm (CaCO₃)
  • Dissolved Silica: ≤ 0.5 ppm
  • TOC: ≤ 0.5 ppm
  • pH, Operating Range: 5.0 - 9.0
  • Free Cl₂: ≤ 0.05 ppm
  • Fe, Mn: ≤ 0.01 ppm
  • Turbidity, NTU: ≤ 0.1 ppm
  • Oxidizer: Not detectable

Electrical

• Maximum Electrical Current: 9A
• Maximum Working Voltage: 160V DC

Important information

Proper start-up of an EDI system is critical for module preparation and damage prevention. Ensure all instrument calibrations and system checks are completed, and that RO permeate quality meets operational requirements before starting. Flush any break tank, lines, and manifolds leading to the EDI modules. Single Pass RO pretreatment installations must include a hardness switch/monitor before the EDI to maintain warranty coverage.

Gases (hydrogen, oxygen, chlorine) produced at the electrodes must be vented to avoid buildup. EDI devices are susceptible to particulate fouling, which can increase pressure drop and impair desalination performance. Oxidizers, such as chlorine, will damage ion exchange membranes and resins, leading to irreversible module damage. Strict adherence to operating limits and guidelines is required for the limited warranty to remain valid. This product is not intended for use in potable water applications.

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Disclaimer: This summary is based on extracted text and may not include all figures, footnotes, or the latest revisions found in the official PDF datasheet. For contractual data, always refer to the specific OEM PDF revision used on your project.

Official datasheet (PDF)

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