Regarding the question on how long it takes -- I've never really timed it but I only run the flush unit for a couple of minutes if I'm at a public dump site. I have the 'luxury' of having put in a dump station at home so I can take as long as I want, or need, when we get home. For the full-timers or those on extended trips I realize that is not an option.
Now, that all said -- when we went to ABQ last fall for family funeral I had to stay at a site out east of town for a night. I was given a sheet explaining water restrictions and such; in Colby KS last spring we were advised no washing of clothes, vehicles, etc., due to water restrictions because of the drought. I don't consider myself to be an ecologist but I guess the brain washings from my daughter and from some of the literature I've read is beginning to rub off on me. If a couple of 2 to 3 minute runs of the turbo wash clears the outflow, then that is enough for me. But, like so many of the things we each do, it is an individual thing.
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