[Jeff Chandler]

It’s the ph level. Its not chlorine. The chlorine raises the ph so you add some.acid to compensate.

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.

[ImJustAnotherOkie]

That’s exactly what i do. But I never had an eye issue from the chlorine level.