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It freezes way too much here, which is was one of the driving forces of this project. Water was getting inside the jars when it rained, and then they were breaking when it froze. I actually have underground water storage on the property... an old hand dug well and cistern that replenish from ground water all year long, and together hold about 1500 gallons.

That sounds like an issue. At least you have plenty of other water.