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I would go with the high-density polyethylene and make the walls of the tank a 1/2" thick. Remember that sewage weighs about 84 lbs/cubic foot, and the tank has to be strong enough to not bulge or sag with a full load.
I would also include an inspection/cleanout port on the top of the tank, provided the top of the tank will be accessible. This way, you can clean the tank thouroughly once in a while. Also, it allows you to clear the tank if it should get clogged. I used a clear Beckson deckplate/inspection hatch on a holding tank I recently helped modify, so that it doesn't have to be opened to do a rough inspection...
A volume gauge of some sort is highly recommended. One of the biggest dangers with a holding tank is overfilling it and having the pressure of the contents blow a hose clamp off someplace or having the contents clog the vent hoses.
I'd install two vent hoses, rather than just the one... to help keep the tank well ventilated. This helps keep the odor of the tank to a minimum.
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Sailingdog
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Telstar 28
New England
You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.
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