We typically are out twice a month with the camper and draw from the tank to keep the water fresh. We may fill from city chlorinated water or from well, but I avoid filling any water that is heavy in mineral or smell. We have not gone more than three weeks without use, so I have not treated or cleaned the fresh tank. I flush the hot water tank one or twice a year and have not seen enough build up worry about cleaning it. You can pump a vinegar dilution into your hot water tank by using the winterizing siphon and not running the tank bypass if you don't want to pickle your fresh tank.
