I am new to this! This has been my first year with a pool (intex ultra frame 18ft X 4ft). After researching I have decided to leave it up this winter. I've read on this forum how to close the pool but not sure what kind of cover I need. The cover that came with the pool has holes in the top so I'm assuming that wont work. Also, where do I buy a cover? One more question.....I plan to drain and start all over with my water next spring so do I still need to worry about adding chemicals to my water before I close it? Thanks!