This Bestway Flowclear pool cover prevents dirt, leaves and other debris from getting into your pool. Practical holes: There are small holes in the pool cover that prevent water from collecting on the cover. This also ensures that the pool water stays fresh for longer: Thanks to the rope, the cover can be firmly attached to the above-ground pool. The pool cover remains securely attached to the pool even in windy conditions.Easy to attach and remove: This pool cover can be easily attached to the pool basin and also removed.