I don't know where I read this. Maybe on the TFP site or another group. The statement that I viewed was that your chlorine that you put into your pool would do more for your water if the PH was at a lower PH level like 7.2 or so instead of 7.8. When I say more for your pool water I'm saying a better reaction on the chlorine to kill more contaminates. I'm just wondering if this is true or not??? Thanks TFP for a crystal clear pool.