Originally Posted By Barefoot Friar

You sure? Muratic acid (market name for hydrochloric acid)


I definately remember the old school muriatic acid treatment we used to use in my grandma's pool.

Newer stuff (pucks, solid treatments etc.) I'm sure is different. Muriatic is dangerous in concentration.

And yes, if you mixed the pool chemicals not in the pool, you make chlorine gas..
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