The service life of EDI membrane stack is limited. Whether it is imported or domestic, we all know that under normal use, the service life of EDI is approximately 3-5 years. In the process of EDI maintenance, cases of failure within half a year or one year are often received, which are not limited to imported and domestic brands. So what are the causes of EDI module damage?

Here are some reasons we often encounter during maintenance:

1、 EDI does not produce water or does not produce water.

① The residual chlorine in the influent water exceeds the standard, resulting in the breakage of EDI resin, blocking the channel, and reducing the water yield;

② The module has not been cleaned and maintained for a long time, resulting in the EDI internal structure;

③ Water shortage operation directly leads to module dry burning deformation;

2、 The EDI operating voltage is very high and the current cannot be adjusted.

① Scaling inside EDI leads to increased voltage and decreased water quality and volume;

② Water hammer phenomenon occurs during equipment operation, resulting in uneven resin distribution within EDI and voltage rise;

3、 EDI produced water resistivity is not up to standard.

① The inlet conductivity is not up to standard, and the inlet conductivity is too high;

② The PH value of influent water is not within the appropriate range;

③ Whether the EDI operating current is turned on too low or too high;

In response to the above issues, we should pay attention to the following points during normal use:

1、 Intake water quality assurance

1. Check the incoming water quality, install an incoming water conductivity meter on the equipment, and regularly monitor the conductivity of the incoming water quality (check whether the instrument probe is abnormal);

2. It is also necessary to regularly monitor the residual chlorine in the water, and residual chlorine testing agents can be used for testing. It is recommended to increase oxidation reduction treatment or replace activated carbon if the residual chlorine exceeds the standard (excessive residual chlorine or activated carbon adsorption fails)

3. It is recommended to maintain the PH value of the incoming water within the range of 6.5-9, and the water quality should preferably be slightly alkaline;

2、 Equipment operation guarantee

1. Regularly clean and maintain EDI modules to ensure stable operation of the equipment;

2. It is recommended to separate the EDI module host. Although the integration is beautiful, the system stability is relatively not so good;

3. Match EDI modules of different tonnage to the appropriate operating current