Gene,
Most of us break that rule, I just bet!
However, Al and I rarely use that water for drinking, sometimes not even for brushing teeth. Depending on how long it had been in that tank, I guess I would think twice about it for cooking my spagetti too, eh?
I'll bet a google of something like, "how long before water turns stagnent" might turn up some interesting and scary facts on stuff that goes bad in standing water??
Besides, many of us boondock or use campgrounds that have no water service at the campsite and we load up and use that water for 5 to 15 days. Disclaimer on the directions, NOT IN USE for more than 1 week.
soooo, is there a difference in standing water that you are using, and standing water that is not run through the lines??
wow, we could go lots of places with this one, eh??
Lets go with that is a CYA for trailer manufacturers???
Cannot wait to read more responses on this one!