Sent an email to APSB (American Pool and Spa Builders) about why Hayward was telling me to keep my SWG cya level 30-50. Response is below. Any comments appreciated since this makes things even more confusing lol.
"I heard back from Hayward and was told that the contradictory responses may be due to the fact that the CYA levels have been revised over the years from 60-80ppm down to 30-50ppm. Some dealers may still be unaware of the change. The lower CYA levels came about from the more recent understanding by CDC and others of the impact of CYA on chlorine's effectiveness. The recommended CYA level is a SWG pool is no different than a non-SWG pool. Hayward does not modify CYA levels based on geography (e.g Pennsylvania v. Arizona v. Minnesota). CYA levels for INDOOR POOLS are recommended to be ZERO as it presumed that these receive no direct sunlight. I hope this helps with your questions."
17,200 in ground pool, DE filter,3/4 hp pump, solar heater, SWG (Hayward Salt and Swim 3C). 1988 Hot Springs Highlife-K Hot Tub (415 gal.)