re: anybody ever turn water main off to prevent pipes from freezing?

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This isn't going to get all the water out. All your low points will still be full. Like someone said, you need a vacuum or you need to put air on the line and use pressure to blow it all out. I'm a lowlife plant operator, so trust me, we drain plenty lines.

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It will get enough water out to prevent your pipes from bursting, correct?

ETA: We've done for years at both our camps with no problems.