Where is mwsmith's post? I just added a quart of muratic acid. The bottle tells me I should add 1 quart per 20,000 gal. every 12 hours. I don't know how many gal of water a 27' round pool holds. I guess I could call the pool place and they could tell me, unless you know off hand.

As far as my CYA, my tester only goes to 30 and I could still see the black dot at the bottom clearly, so it would have to be a lot lower than that. I could take some of my water to the pool place and they could test for me if it's that important.

Thanks for helping me out. Wendy