What happens when high chlorine residual levels are applied to the softening units?

• A. Could Damage The Resin And Reduce Its Lifespan
• B. Protect The Resin And Increase Its Lifespan
• C. Could Halt The Softening Process
• D. Can Pass Through Most Softening Units And Would Not Affect The Softening Processes

Answer: (A)

Chlorine residuals are strong oxidizers, and the resin used in softening units is an organic polymer. When exposed to high levels of chlorine, the resin’s polymer matrix is attacked by oxidation. This can cause the beads to become brittle, break down, and lose their ion-exchange capacity, shortening the life of the resin bed. That’s why the correct outcome is that high chlorine residuals can damage the resin and reduce its lifespan.

The other ideas aren’t consistent with how chlorine interacts with resin: chlorine doesn’t “protect” the resin, it degrades it; it isn’t typically going to halt the softening process outright in a stable bed (the damage shows up as degraded performance over time rather than an immediate stop); and chlorine can pass through a softening unit but will still affect the resin, not leave the unit completely unchanged.