This may sound like an odd question so I'll give a little background first. I'm a little OCD about flushing my tanks, ok ok, I'm A LOT OCD about flushing my tanks. I've been in a couple campers that...
I don't store my food, dishes, or clothes in it. I don't let my kids play in it. I don't let our dog drink from it nor do we. We don't sit around on a nice evening and stare into it.
and...we certainly don't use 300 gallons of water to clean it each time we do use it.