I have a "self draining" cover on my 18' round. Each year I buy a new vinyl coated cable to secure it around the pool. I have a winch type mechanism that utilizes a padlock for security. I also have enough top rail clips to place 2 clips on each rail section. This has been the most secure cover I have used. No wind gets under at all. Last year due to a liner leak I had lost almost half the water in the pool. The cover stayed secured in place all winter. Needless to say the "self draining" did not drain due to the loss of water. The cover had filled with water to a little less than a foot of water. I think everything was okay due to the slack in the cover. Had it been too tight a fit the walls may have caved in. This year I plan on using the cover I have and adding a mesh leaf net over it for easy opening next year.
Brian


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