*Composting toilets*Graham has discovered that there are a few kinds of composting toiletsthat have already been approved by the county, for example, the Sunray.Can we get a volunteer to research this and generate a list?

Per a conversation I had with relevant authorities four or five years ago – any commercially manufactured composting toilet that is NSF approved can be used in a permitted dwelling in place of a flush toilet.That includes SunMar and Phoenix and various other NSF approved (or maybe ‘certified’ is the word) brands. Kea’au Hawaiian School for example has a high-end Phoenix brand unit.
Mojo saysthat most of them are pricey and small capacity,

Yes – cheapest is SunMar NE at $1500 (not including shipping to Hawai’i).And you still have to have a cesspool/septic for the rest of your household drain water.
for only one or two people.

There are some that can handle more, and, they cost more. The Kea’au Hawaiian School unit is a higher capacity (don’t recall what exactly).Most use electric heating elements to deal with urine, so if you’re off grid you’re still SOL (so to speak…:-).
In general without electric heaters and/or fans small commercial units don’t work as well as much cheaper simpler DIY designs (double vault or removable barrel). Urine is the main problem. They are trying to make it “just like normal” so that people can pee in them and not have to do anything different, and that is really hard to deal with, especially in small units, without electric heaters vaporizing the excess liquid (urine) and thus the nutrients as well. Quite insane – use hundreds of watts of electricity inefficiently to vaporize valuable nutrients, and call it an “ecological” toilet.
> Anything that is larger will need a special test to get a model
approved, which takes $20,000.

I was told anything NSF certified is good to go – nothing was said about size – someone could verify that.
cheers,John S.