A month ago (i opened our new pool - old pool - new to us)i tested my CYA at 100+.. I drained 50% and it was down to 80s.
i got a wonderful green pool now so i drained more than 50% and refilled and started the SLAM
i tested CYA again and it is 100+
does algae or slam affect cya?
how in the world did it go up? Even if i was at 200 initially i should be lower than 50 now!
my autofeeder is empty and i use no products other than "splash pool shock" 12.5% sodium hypochlorite liquid chlorinator and regular household bleach