Clearwater Resin Fouling / Inadequate Pretreatment

Clearwater softener causes iron staining or sulfur odor even though hardness is reduced.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

High iron or sulfur in raw water, Resin fouled with iron bacteria, No iron filter installed ahead of softener, Infrequent regeneration

How to Fix / Troubleshooting

Safety first: Some cleaning chemicals are caustic; follow all label safety instructions and wear PPE.

  • Test raw water: Check iron and sulfur levels. If high, a dedicated Clearwater iron/sulfur filter may be required ahead of the softener.
  • Clean resin: Use an approved resin cleaner for iron and run a manual regeneration according to product directions.
  • Increase regen frequency: Adjust Clearwater settings so the softener regenerates more often to prevent fouling.

Severely fouled resin may need replacement, and pretreatment should be added to protect the new media.

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Repair Difficulty

Medium 3/5

Required Part

Clearwater cation resin
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