It’s the ph level. Its not chlorine. The chlorine raises the ph so you add some.acid to compensate. This is all.a bull$hit scam like all the others.
“The chlorine raises the ph so you add some.acid to compensate.”
Well urine has acid in it...
You are half right. Improper pH level — either high or low — is another couse of eye irritation.
Liquid chlorine raises the pH, but Trichlor, the tablets used more often than liquid chlorine, lower it, as does Dichlor (pool shock).
A strategy I used when I had a pool was to use Trichlor as my everyday sanitizer, and shock the pool once a week with liquid chlorine. I never had to add muriatic acid.