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Originally Posted by Spot
I had flush 2 setups with 50% vinegar and 50% distilled water. It did get some stuff out. BUT, do not leave it overnight if you're not running the pump, the white residual formed is an even bigger headache.
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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.
L