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The one area I’m always skeptical about is “did the air I used to blow out my system with remove the residual water in the water pump cavity”?
I drain and blow out my system and bypass WH... Then I still suck in RV antifreeze to make sure the water pump is protected and I run antifreeze out all the taps , toilet, etc
I also pour a cup down the sink and shower drains for the P traps.. and I pour sme in toilet bowl to keep seal lubricated.
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