Back in the '50's, Monomatic made a 'recycling' toilet... it uses 'black
water' from its small internal holding tank over and over again... i have
one i got from another lister some years ago, for the Trailwind Project; i
haven't used it yet, but it seems like a last resort solution from the
pre-holding tank era... my thought was to re-plumb it so that it used gray
water piped to the flush inlet side, and run the outflow to the black water
tank... just an idea that i've had floating around.
tuna
reno, nv