The roller itself can’t normally be blown by the wind, but there can be reasons why it is being moved in windy conditions.
The ropes have been installed too short. This is raising the end of the cover off the pool surface, enabling the wind to get under the pool cover, move it, and pull the roller (by the cords) into the pool. Install the correct length ropes (2 meters as supplied) and leave them that long so there is plenty of rope between roller and the cover lying flat on the pool. Any excess can be wound around the roller tube.
The roller’s over-cover is being stored on the roller while the pool cover is on the pool. The wind can get under the over-cover (like a sail on a yacht) and propel the roller into the pool. Remove the over-cover and store it elsewhere. This won’t happen with the pool cover stored on the roller and the over-cover installed because of the combined weight of the cover and roller.
The cover is too large and protruding above the side of the pool. The cover is then lifted by the wind, still connected to the roller by the cords, and pulls the roller. See Technical Question: Cover Blowing Off The Pool.
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