Solar Cover Grommets

They are supposed to allow water on top of the cover to drain back into the pool.

Based on their suggested placement near the edge of the cover, I don't really see a need.
I use a cover on a reel and have never had an issue with water draining off - without use of drain grommets.
 
My solar cover never went on with the same air pockets twice. Then I'd brush them out the best I could, never leaving the same small air pockets twice.

I imagine Murphys would come into play alot and the grommets would sit a few inches from the rain puddle on top, just laughing at me.
 
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