We are borrowing this idea from friends who use it all the time and haven't had a problem. You fill bleach/milk jugs and place them all around the outside of the pool on the ground. Then, you tie rope to one jug, then cross that rope completely over the top of the pool to the opposite side, and tie the other end to a jug on that side. And you do this with multiple ropes crossing to the opposite side. The ropes then hold the cover down. Think of a pizza and you slice from one side to the other, making many slices. Each 'slice' mark represents rope crossing over the pool attaching to a jug on the other side. Hope this is clear! This will be our first year trying it...