Once spent 3 weeks aboard with myself, my wife, and two small kids.
Maybe were just less full o' **** than most. My wife suggested the
porta-potti. Yes, I did read everything I could find on marine heads
and replaced the old piping with supposedly impermeable stuff before
deciding to make the switch. I never have head problems and never work
on it now. I just haul it ashore every few days when we use the boat,
no big deal. You have to understand that my wife and I were always
outdoors fanatics so the boat is like luxury to us. We spent our
honeymoon (1980) camping for 3 months along the continental divide in
Colorado and WY. She was finally hurt in a climbing accident (broken
arm, chunk outa her hip and broken toe but still wanted to camp. We
finally gave it up and went back to civilization when the snow was
collapsing the tent every night. AND that was just the beginning so
you can see that having the luxury of a porta-potti and real drinkable
water aboard seems like the Hilton by comparison. My daughters dont
seem to mind the porta-potti either (19 and 9.)