Lori, Your chlorine (you say shock) calculations are too indistinct.....Do you know how to use PoolMath?
I believe I do, Dave, but please correct me if I'm wrong... According to the chart, with a CYA of 70, the target shock FC would be 28, which is what I brought it up to last week using household chlorine bleach. It has since dropped down to 16 so I'm wondering if I should bring it back up again to 28 before closing? If so, according to the pool calculator, I would need to add 166 oz of the liquid shock the pool store supplied me with (which is 12.5% sodium hypochlorite and 87.5% other ingredients - that is just a stronger form of bleach, correct, so I would use the bleach field with 12.5% plugged in?). The pool is 13,500 gal. I figure I might as well use the liquid shock from the pool store since I paid so much for it. :-( Next year, I'll just use bleach to close the pool, just as I did when I opened it!
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