Hi! I'm relatively new to TFP and have been trying to move my recently-acquired pool to BBB. I have very high CYA (~700, I think, having diluted my sample 4:1 with distilled water and getting a result of over 100) and although I've got 3 bags of Bio-active, I'd like to kill the algae first. I'm pH-okay, and my FC is now 25ppm (TF-100 kit), but is that enough to kill it? Being in California, there's a strong discouragement to draining. Suggestions?