That is what I would have expected in a 2012 Class A unit as we'll, but no. There is a filter for the drinking water tap at the kitchen sink and for the frig but that is it. I had a filter installed before the hose at the city tap so all water entering the unit was filtered and that was the first thing I removed when this all began, yet the foaming continued. The filter was not installed at the time of winterizing or de-winterizing.
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Harvard wrote:
There must be a filter inside the RV that filters only the city water and that filter housing is contaminated with residue antifreeze.
