It's my first post. I had an algae bloom. It was pretty bad. I shocked the pool with Clorox shock treatment with algaecide. Well this had dichlor in it. My cya went through the roof (250). Could not get the pool clear. Then I found your site. I learned what cya was. Switched to liquid chlorine. Bought the fancy test kit. I let the water evaporate out the pool, I live in Cali with drought restrictions. Draining was not an option. 3 months later, I'm sitting in a crystal clear pool with a cya at 50. Chemicals are perfect. Thank you for all the information. This site saved my pool. Alex