Going back to chemistry....thanks for the refresher! Such good info on the forum. I believe we are ok now, but wanted to run these numbers by you. FC 3.5ppm, CC 1.5ppm, TC 5, PH 7.4, ALK 130, CAL 250, CYA 35. I know we don't need to worry about the calcium, but I'm not sure about the chlorine. I think it is fine...a little on the high side now, which is fine...we aren't swimming now and the algea is gone, water is clear. Thank you!!!!