Hi. I, recently, noticed what I believe is MA growing on the sides of my plaster 15000 gal pool. I've been using your method for two years now with no issues but I believe the algae started because my FC got too low after my fusion 2 mineral cartridge failed. I've been slamming for days now but still have overnight cl loss. I realize slamming indicates maintaining but I'm unable to maintain during the day. Am I wasting my time and money then? Basically, I raise to about 16ppm overnight and when I return later in the day it's down to around 5ppm and I shock again. My CYA, i believe is between 20 and 30. Thanks for help.