Causes and Repair Methods of EDI Module Failure

EDI modules play a pivotal role in pure and ultrapure water production systems. Their impeccable functioning is imperative for maintaining water quality. However, just like any system, EDI modules are prone to failures that can disrupt the water treatment. This blog post dives into the primary causes of these failures and outlines comprehensive repair methods to address them.

EDI Modules view

Causes of EDI Module Failures

1. Overheating Due to High Current and Small Flow

Extended operation at high currents with minimal flow can lead to heat accumulation. This undissipated heat causes the EDI diaphragm near the poles to deform, resulting in increased pressure differences in concentrated water, affecting water quality and volume.

2. Neglected Cleaning and Maintenance

Without regular maintenance, calcium and magnesium scales form on the EDI membrane and its channels. This buildup escalates the pressure difference between the inlet and outlet water, leading to deteriorated water quality and eventually making the module unusable.

3. Organic Matter Accumulation

When EDI modules are not regularly cleaned or inactive for extended periods without protection, they become breeding grounds for organic matter. Like scale formation, this buildup also affects water quality and hampers the module’s operation.

4. Unreasonable Cleaning Methods

Inappropriate cleaning can damage the EDI resin, negatively impacting the water’s quality and quantity.

5. Water-Deficient Powering

Running the EDI system manually in a water-deficient state can cause the diaphragm and resin to overheat and carbonize, rendering cleaning futile.

6. Absence of a Security Filter

Without a security filter, foreign matter can clog the EDI channels. Inadequate pre-treatment and system design and control system failures can exacerbate this issue.

7. Exceeding Rated Current and Voltage

Overstepping the stipulated current and voltage values or mishandling the system can lead to failures.

8. Inconsistent System Maintenance

Not adhering to the prescribed EDI usage conditions can compromise the system’s efficiency.

EDI module structure

Repair Methods for EDI Modules

1. Drafting a Maintenance Plan

Creating a preliminary maintenance strategy is essential based on the user’s data.

2. Module Inspection and Cleaning

Upon receiving the malfunctioned membrane block, inspect and clean it on the machine. If required, dismantle it for a detailed inspection, replacing damaged components like polar plates, diaphragms, resins, separators, sealing rings, etc.

3. Post-Repair Testing

After repairs, the module should undergo a 48-hour test to ensure its effectiveness.

4. Optimization Assistance

Post-maintenance, help customers iron out any issues in their equipment process and operation.

5. Provide Cleaning Solutions

Offer specialized cleaning agents and comprehensive cleaning and maintenance programs to customers.


Regular maintenance and a thorough understanding of the causes of EDI module failures are paramount in ensuring the longevity and efficiency of your water treatment system. Adhering to the prescribed repair methods and staying informed about potential issues can help mitigate risks and ensure seamless operation.


What is the impact of long-term operation at high current and minimal flow on EDI modules?

This can lead to heat accumulation, causing deformations in the EDI diaphragm and affecting water quality and volume.

How does organic matter accumulation affect the EDI system?

It increases the pressure difference between the inlet and outlet water, leading to a decline in water quality.

Is it possible to replace the damaged internal parts of an EDI module?

Yes, parts like polar plates, diaphragms, resins, separators, and sealing rings can be replaced during maintenance.

How can I prevent the buildup of calcium and magnesium scales in the EDI membrane?

Regular cleaning and maintenance are essential to prevent scale formation.

Why is a security filter necessary before water enters the EDI?

A security filter ensures that foreign matter doesn’t block the EDI channels, maintaining the system’s efficiency.

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