I like the garbage bag idea, as well as the "split the bucket and hold together with bungees".

I'd pick the plastic bag method first, and even combine it with the split bucket method.

I don't think ANY of the release agents that you'd use would hurt the pond. Even motor oil. Coat inside of bucket. pour in cement, making sure it's not too wet. Let set up, knock the sides of the bucket with a dead blow hammer a few times, pull off.


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