My SWG inground 12,000 gallon pool was completed in January this year. We had the CYA up to 100 ppm and all of a sudden in June the CYA tested 50 ppm on both liquid test and strips and has been that way every since. I want to maintain 80 ppm and know I need about 3 lbs of CYA to get up again to 80 ppm.
My question where di my CYA go?
I thought it doesn't evaporate.
I have cleaned my filters 3 times since filling in Janauary and have only drained the pool about 2" because of rain.
Could these things together reduced my CYA 50%?