Probably a stupid questions, but if you have some pin holes in your pool cover and get some rain on it, which way will the water go? From the pool to the top of cover, or from top of cover to the pool.
Water will tend to go from the pool to the top of the cover while the cover is loosely sitting on the water.
You can reduce the amount of water that goes through the cover by pulling it out some to increase tension, but don't try to make it sit above the water.
Think about it as if the cover was porous mesh. It will reach equilibrium and sag based on the tension.
Try to keep the cover clean and pumped off and snug enough to keep the wrinkles out but not tight.
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