I need to reduce my PH and ALK and increase my CYA. Which one should I do first? Recommended numbers for a vinyl pool with SWG are CYA 70 - 80, PH 7.5, ALK 60 - 80. I use the SWG to maintain my FC but I use bleach to increase it or SLAM when necessary. I SLAM'd when the pool was opened because I had algae.