Well I have two issues with the pink stuff in the water lines.
#1. DW has very sensitive fast and can taste well after several flushes.
#2. We camp throughout the winter here in the PNW. Several of our favorite campgrounds are not full hookup,'so flushing the system becomes a real issue. We
Do get down to 20 degrees from time to time during the winter, no issues yet. I have winterized as many as four time and as few as once. I don't re-winterize unless it will get below freezing,'or work takes me out of town more than a couple days.