We should probably move this discussion to a new category other then For Sale.

Regarding your question above:

You are correct.  There is no way that composting is completed by the time you have to dump the bucket.  Even if it only took 2 days to compost (it takes much longer than that), the poo from the last 2 days would still be mixed in with the "composted" poo when you dump.  As someone in one of the links you referenced said, you're not really making compost but rather a sort of pre-compost.  The poo in the bucket is going to range in age from about 3-4 weeks (first deposit) to a day (the last deposit).  This is based on a couple using it full time.  The older stuff will have been rendered completely unobjectionable and will resemble potting soil.  The newest stuff will be mixed in with it.  Even when our unit was working great and emptying it was totally unobjectionable, because we knew there was some relatively raw poo mixed in, we always bagged it up and deposited it in a dumpster.  I'm sure the composting continued inside the (double) garbage bag at least until the oxygen inside the bag was used up.  Considering what we've seen people do with dirty disposable diapers, we felt just fine with this practice.

But, yes, the only way you're going to compost the whole batch is to be able to let it sit idle for a few weeks prior to dumping.  And, we were able to do that occasionally when, after being anchored for awhile, using the AirHead, we would hit a marina and be able to use shoreside facilities for a month or so.

-Steve

 
We cruised Mexico for two years with a Wilcox Critenden which is considered the Rolls Royce of the marine heads. The last few months the Wilcox was binding and we would have to remove the bowel and grease the cylinder to get it to work. We also replaced the hoses once in Mexico and again after returning home. Vinegar didn't help. We think we finally corrected the problem with the head when we returned home and would have replaced it with a new one if we could have found one, but they were no longer made.

Some people do as you say and use their holding tank, but many we know didn't. We knew a couple  of cruisers whom waited until night to pump their tanks. Also most of the sewage winds up in the sea either untreated as in the smaller villages or partially treated as in Mazatlan.  We and our buddy boat went through the permanent sewage slick about three miles off the beach in Mazatlan running our water makers. You can see the slick as you fly in. We later found out the plant is only about 2/3 the size it needs to be and is usually broke  The outflow pipe in La Cruz dumps right at the end of the breakwater in the anchorage which you can smell when you go in.  La Paz has two plants which I understand work as they should.

"Toto, I've a feeling we're not in Kansas anymore" really applies when out cruising.

Jim