Last week my pool's FAC dropped to 0.5ppm, so it got cloudy. We tried to fix it with a small shock, but now the pool has turned completely green and looks awful.
It is a 500,000 gallons public pool. As a source of chlorine we use calcium hypochlorite and trichlor. I used Copper Sulfate yesterday but it did not work (It didn't stain, plus, the concrete in the pool is already very damaged)
I want to slamm it tonight. According to my calculations, I need 190lb of calcium hypochlorite (I know it's better not to use that because it can make it cloudy, but I only have trichlor and calcium hypochlorite. Buying something else is not an option, unfortunately) to take it to 30ppm of FAC. Then maintain it there until there is less than 1.0ppm of FAC overnight loss, the pool is clear and CAC is less that 0.5ppm.
Is that correct? Will it work?
Also, I am not sure whether I should slamm the pool today. The pool looks awful, but I'm not sure if it's unsafe for athletes to swimm in 30ppm of FAC, even if the CYA is 80ppm. Unfortunately, closing the pool for a few days is not an option either (I tried once and it was a huge mess).
Should I slam it or wait until the weekend comes? Taking the risk it will get even greener and cloudier than it already is.
Thank you for your help!