What would cause my Chlorine reading to go up overnight doing the OCLT. At 11:00 I took a reading off 22.5 . Now at 5:45am the reading is at 25. Yes, abuse the FAS-DPD kit. New sand put in our filter before starting SLAM.
Welcome to TFP! For a wealth of pool care information please check out our free Pool School. If you are in need of specific help then we encourage you to Register and ask us here in the forum!