Join Date: Feb 2010
Location: Narragansett Bay
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Re: How big a holding tank vs. camping
Pee: Dry bowl (NO lake water intake). After going, fill a cup with fresh water from the sink. Pour water, using quick swirl motion, into bowl. Pump bowl dry. That's it. This eliminates much of the volume going into the tank--pumping lake water into the bowl. Folks don't realize how much water this pushes into the tank.
Poop: Follow same method as above. HOWEVER, add one extra step; before going, be sure to pour a cup of water into the bowl. If necessary, swirl a second cup through the bowl after going.
Using this manner, 3-4 adult males can make a ~25 gallon tank last the better part of a week. When tied up in the evenings, use shore facilities. While at sea, guys can pee off the back of the boat.
While this method will conserve capacity, it also leaves waste in the hoses, which is the number one cause of odor. If your waste lines rise from the head to a vented loop and then return down to the holding tank, it takes a good gallon of clean chase water to flush them out.
We once had a girl at the helm. A guy peed of the back and she had no clue.
I have no problem with peeing over the side in open water, but it is technically a violation of discharge laws and there have been people cited, if witnessed doing so.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.