Composting TECHNOLOGY is fine...
And Sun-Mar makes the best composting toilets on the market. However, go to the Sun-Mar websit (sun-mar.com) and take a look at the size of their self-contained units. I seriously doubt if you could get it into the boat, much less find room for it in the head. Although there have been some attempts to market smaller composting toilets, they don't work...Sun-Mar's made 'em about as small as they can be made and still come even close to living up to expectations. But there's another issue with using a composting toilet aboard: what to do with the excess liquids. They have to be drained off, because wet soggy organic material doesn't compost, it rots...and stinks. And about 90% of what goes into any toilet is liquid. It can't legally be just drained overboard...it has to go into a holding tank. So there goes any advantage to having a composter. Then there's the matter of the 3" vent stack, and the bags of peat moss you'll have to carry aboard--'cuz it's necessary to add a dry organic material that breaks down quickly to each "deposit" in a composter to absorb as much of the moisture as possible. I get asked about composters on the average of once a week. They're wonderful for what they're designed to be: toilets in remote cottages. But on any boat except a houseboat, they just aren't practical for use aboard. And before you ask, incinerating toilets are even worse!
