On friday i noticed a larger than usual chlorine drop. I decided to try the ofclt. Saturday morning I comeup with slightly over 1 ppm loss. By the way, pool water is crystal clear, no cloudiness when brushing. So I bring my fc level to 30 ppm. My cya is 65, I know a little overkill on fc. I maintain that level throughout the day and when the sun goes down, i bring the level up farther. 2 hours later I test to start the ofclt. This morning I test and get a loss of 12 ppm. How is it using more overnight now than before I slammed? I have the tf-100 test kit that I am using. Just trying to figure out what I have going on. Also, in 24 hours thr filter pressure has only increased 1 psi or less than 8%, which isnt any more than usual. I thought it would go up more since killing the organics?