Here's What Chlorine Does to Rubber Seals
Chlorine breaks down rubber and plastic even at the concentrations that are common in a city water supply. While many people know this, it's not often that you can see a real-world concrete example. I recently changed out a toilet tank seal where the effects of chlorine-on-rubber were super obvious:
Aquatell sells a range of chlorine filtering systems that will protect your dishwasher, washing machine, and every other rubber seal or plastic component from the effects of chlorine damage.