Important and the closed coating of the pool. If you just protect it from garbage, sand and wind, then a bubble coating for pools will come to your aid. If you need to cover the surface from pets or a child, then take care of a more solid protection that will withstand the minimum weight of a small person. Well, the frame protection of the pool for the winter period is the personal matter of each owner, whether you want to use water surface in cold weather, it is you to decide individually.