What chlorine level to shock -- now that half my CYA is gone

[JimK]

I must admit the first time I came across your site some years ago, I wasn't sure what to think of it. After all, my go to person at the pool store was an "expert" with many years experience (to his credit he was never pushy about selling chemicals).

However, it became apparent over time that their recommendations sometimes did not work and only resulted in dumping more money into the pool. The last straw was when I discovered that the reason my pool was staining was from all the copper algaecide they had me use (I kept getting the beginnings of an algae outbreak (slick liner) so they had me start using the algaecide; it did work though).

After spending $$$ to deal with the stains and copper (from info I found on the internet ), I started really reading your site and giving your methods a try........best thing I ever did as a pool owner! . My pool is now much easier and much cheaper to maintain with FAR fewer problems.

[PoolDoc]

Thanks.