After a wonder first season using the BBB method, I failed as a BBB member during the off season. My pool cover blew off and I didn't replace it. Now I have a green awful mess. I have an 24ft x 4.5 ft. above ground. I know the process to turn it back but I am wondering if it would not be less expensive to drain it. But I have a liner and I am worrying about liner shrinkage. Any suggestions?