I will have to look up the filter model number...other than what I already posted...Hayward DE filter...
I am not sure.

CYA was 40 when the pool was closed and was actually brought back to that and fine after our first shock treatments...but when the chlorine wouldn't hold, we were instructed to until add 10 lbs of granular chlorine at a time every so many hours as we tried to get the chlorine to hold at 5 ppm for 24 hrs. Then the CYA went through the roof and chlorine just kept disappearing...along with a ton of money.

Testing with aquacheck strips and took two samples to two different pool stores and all results were the same.

When I put the two bleaches in at night, does it matter what the chlorine drops to the next day?