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The problem is the lack of FLOW in the flushing process.... due to the small exit venues usually available... hence my recommendation to take out the freeze plugs and use a directed nozzle on a flexible hose to get down to the bottom of the coolant cavity...and a vacuum inserted will help with muck too heavy to bring to the freeze plug holes .
If you have something like a concrete vibrator with a flexible enough end.... ideal for loosening that built up and concreted sediment.
If someone wants LOW Oxygen water... collect the house AC drip.... also a good reason NOT to use that to water plants... the opposite of hydroponics... which adds oxygen like an aquarium pump does for fish survival...
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