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Looking at the numbers in Pool School it looks like there is a big difference between what is classified as a shock based on CYA and what the chem makers say a bag can do. For example in Intheswim it says I can use 1bag per 10,000 gallons, thus for my pool I need 2 bags. With 2 bags its a...

I just got green algae and am trying to round up what I will need to get to shock level and hold. I'm almost ready to close for season and dont want to go buy a bunch of stuff...I have some aquachem shock leftover, some HTH stuff and a few things of bleach...Combined I have enough to get to...