I've noticed recently that more and more chlorine was needed to maintain FC. The water has been crystal clear since I filled it about a month ago. Chemistry has been right on other than allowing FC to drop below the minimum a couple of times. CC has never registered more than .5, and that's only been in the last several days.
So yesterday I decided to SLAM in order to get ahead of whatever might be in there. I accidentally brought FC to 25 (forgot to change values in poolmath). Anyway, last night it was 25, this morning it was 20, and now it's 15. Is this normal for water that's always been clear and never shown visible signs of algae?
PH 7.6 (before slam)