I use antifreeze for winterizing. So when I run antifreeze thru the toilet line, it leave some antifreeze in the bowl.
And I do run antifreeze thru the black tank flush line. After running antifreeze thru the outside shower, I connect that shower hose to the black tank flush and use it to run antifreeze thru the black tank flush line. My black tank flush has a check valve behind the screen washer so it does not drain when disconnected.
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Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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