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post #268 of Old 02-27-2013
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Re: Newbe with no experience buys big boat

Thanks Kat! I think a wooden (1/4 inch plywood) holding tank is extremely unusual! Even if you have a standard plastic tank, it can still stink up the entire boat. As I understand it, the waste stinks when it decays anaerobically, without oxygen, which happens if it's in the tank too long without proper ventilation. Most tank vents (such as water and fuel tanks) are needed only to let air out of the tank as water or fuel is put in. In a holding tank, the vent must be large enough to allow sufficient air and oxygen into the tank to produce aerobic decomposition. The standard 1/4 or 1/2 inch vent is too narrow, I read in a Practical Sailor article about ten years ago. An inch and a half might be better, two vents better still.


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