Join Date: Jan 2012
Location: British Columbia
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Re: Air Head Composting Toilet or Similar Mfg.
The problem is that the unit needs to be coastguard certified as a type II MSD. I asked about this with the designer of the Nature's head. Both the Nature's head and Airhead are type III, which is the same as a portapotty as far as the USCG is concerned. You can't (legally) dump the contents of a type III overboard within US waters.
Also, the Nature's head and Airhead don't compost the fecal matter to a safer level than fresh fecal matter. Mostly they store and dry it. In order to safely compost human manure it must be composted at high temperature. See also: "thermophilic composting". For further reading I HIGHLY recommend "The Humanure Handbook."
Anything which doesn't discharge overboard is legal, as it is none of the coast guard's business, if it doesn't enter the ocean..
Brent Swain, Boat designer, Builder, and author of "Origami Metal Boatbuilding"