Loads of scale in Hot Water tank.
I have always flushed the hot water tank every year with my past RV's and have never noticed much. This year we bought a 2007 Forest River Lexington. I thought I would flush the tank before we used it...
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Only issue you might have is at the faucets and shower head. Be prepared to clean them out a couple times. Not usually a bit issue but a nuisance.
