ArdraF said:
Okay, I have to ask. Why would you do that for such a long period of time? We do that occasionally but usually hook up the hose and use campground water (e.g. "city" water).
I'm a fulltimer and haven't hooked up to city water in years. I fill it with city water.
I also don't ever leave my gray tank open. (In fact, I just read about someone whose trailer was flooded with sewage, and it turned out to have been a blockage in the campground's system, and it backed up through this person's sewer connection, up the hose, out the shower drain and overflowed the shower; the question was in the context of whether the trailer should be totaled by the insurance company.)
But back to the fresh water, using the tank all the time means that water is continuously cycling through there, so it doesn't get stale and might be less likely to start growing stuff in there. Plus doing this for so long has made me very familiar with how long a tank lasts, which comes in very handy when I'm boondocking. And it's always the same flow coming out of my faucets.
By using the tank, I don't have to leave my hose outside, exposed to UV or whatever and baking the water that sits in it and possibly growing stuff in the hose. Or freezing the hose in the winter. I never have to do anything different if I'm in hot weather or cold weather or whatever.
Plus it makes for a spiffier looking campsite not to have it lying around. And finally, the sight of bulging water hoses at RV sites always makes me a little nervous, and way too many of them leak at the connection, which hurts my conscience.
I'll note that I have a 100-gallon tank, so it lasts a long time. Refilling it once a week or so, and emptying the gray at the same time, isn't much of an inconvenience.