Disposal Pump

Can a composting toilet be used permanently? How do they work?

Because of septic problems I am looking into other waste disposal options. I came across composting toilets online. Are they stinky? Do they need to be pumped? Can they be used permanently as long as pumped? Is it legal to dump the "fertilizer"?
I want something as natural/normal looking as possible, is this fairly similar to the usual toilets in homes?
Any information or links to websites, would be greatly appreciated.

Thank you.

Composting toilet are very simple to construct. All the waste are taken to the underground chamber and there the bacteria does its work and break down the toilet wastes to Methane and Carbon dioxide. These gases and vented to the atmosphere through a vent which is kept on top of the chamber. so the toilet as such will not be smelly and it should be like your normal toilet. It requires pumping out the sludge once in a while - say once in 10 years. This may depend on the load and size of the chamber.

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