Howdy from TX. Been struggling with pool for last 3 months. Had black spots in July, got rid of those by adding 25 lbs of granular shock per Leslie's. Can't argue with results, black spots gone in 4-5 days. Since then have reduced CYA by removing/adding H2O. Current Leslie's test results:
TAC 0 (added 2ga of liquid chlorine 2 days ago)
Salt 2700 (added bag today)
pH 7.8 (added 30oz today)
Phosphates 300 (I know, who cares)
Spa attached to pool, spills over into main pool area
Hayward/Goldline Controls SWG, but replaced motherboard last year with aftermarket version. Chlorine has been my struggle all summer. Can't seem to get pool consistent. Can't figure out what to do about the constant zeroing of TAC/FC. Suggestions? Any & all help appreciated! Thanks!