The resin contaminated with iron has a significantly darker color tone, appearing dull brown or grayish black in appearance. The compressive strength of the resin is reduced, and the water production rate at work is significantly reduced. Reconstruction is difficult, and the pollution may be caused by high iron content in the water source (>0.3mg/L) or poor corrosion protection of old steel water purification equipment or simply lack of corrosion protection

Preventive measures: For water sources with high iron content, it is not allowed to directly enter the exchanger. It is necessary to first carry out iron removal to solve the problem, and then carry out ion exchange method.

Pollution of active residual chlorine. Excessive residual chlorine in the source water (>0.5mg/L) can cause damage to the resin structure. After poisoning, the color tone of the resin will significantly fade, the clarity will improve, the volume will expand, and the compressive strength will sharply decrease. Resin crushing, but the resin exchange capacity does not decrease in the early stage. Key injury: resin severely contaminated with residual chlorine, causing all damage.

Preventive measures: When the active residual chlorine in the well water exceeds the standard (>0.3mg/L). Can set up an EMDT activated carbon filtration device in front of the EMDT switch, or add sodium bisulfite to the water to remove active residual chlorine

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