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Originally Posted by Mathelo
I flushed it with the 50/50 mixture for an hour and then replaced it with straight distilled water for a second flush. I'd never leave that in the system that long.
My father had one of the first residential central air system back in the 50s - water tower and all. Every year he ran a vinegar and water solution through the "loop" to clean it out. Some methods have been around for a long time. 
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Actually I left it for 3 nights, because I totally forgot about it!
I am not against the method, I am for it in fact. Just don't do it like me.......