Originally Posted by Flybob
The filter bowl and the water pump chamber are the two items in the water system that are not winterized when only blowing out lines and not adding antifreeze. Not saying the compressed air method is not effective, only that these two items must be addressed separately.
^^ X2 ^^
The water pump and the filter/bowl are isolated/protected from the city side of the system by the internal check valve in the pump. During winterization, using compressed air to blow out the lines via the city water port does not address the water left behind in these items.
Yes you can run the pump 'dry' but it really doesn't get all the water out unless you suck some pink stuff in.