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Message: [QUOTE="Sunshine, post: 259308, member: 2203"] I have a thought (since I'm far from an expert). When I ran my falls, there was a sheet of ice with the water running behind it. Wouldn't the same principal that ice and snow on top of your pond act like an insulator apply here? The water wouldn't be air temp obviously or it would be frozen. It's running behind the ice. I would think people that use air stones would be more at risk of cooling the water since you are drawing air temp and adding it to the warmer water. Thoughts? [/QUOTE]