I am currently in the process of slamming my pool. I have been going for 4 days and now into the 5th day. My question is regarding the use of a pool cover during the process. Due to a low level of Cya, pitching at 30, my theory is by using the pool cover during the day I can reduce the loss of chlorine due to sunlight while shocking. The pool is crystal clear and has been the whole time, consistent recordings of 0.5 CC. My OCLT recordings are failing by drops of 2.5 to 2.0 FC over the course of the 4 days (2.0 drop last night)and have kept the pool cover on for the past 2 nights. Should I take the pool cover off during the OCLT for a more reliable reading.? Also just wondering what a reasonable time frame for passing the OCLT would be keeping in mind the information provided?