i have heard of people building an enclosure for an electric trolling motor and running it to keep the water moving. it is supposed to work quite well...not to mention it puts some motion on your dekes too. you might want to check the laws in your state before employing this method though. you might run into some trouble.
We have the same challenge and no answers. When I lived in AZ, we had a solar cover that helped warm the pool. I was thinking about trying it with in our puddle this year. We are in the woods and don't get high winds, so a decoy weight at each corner would probably keep it in place.
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