Relatively new pool owner / TFP follower here. Not knowing any better, used trichlor tabs for about 1.5 years here.
Stopped tabs on August 8, and switched to liquid chlorine.
Prior to yesterday, got two consistent readings of 104 for CYA after doing conservative water replacements.
Yesterday had big rains (remnants of Erika storm). During the storm, I dumped approximately 2000 gallons.
This morning pH was 7.8 (previously 7.5), FC was 4 (previously 9)... but CYA was still 104... after performing the test twice (dilution method)... what???
Any thoughts / recommendations would be sincerely appreciated. Thank you.