I agree it would be a lot cheaper using a cheap shop vac.

The ultimate cheap effective home built suction poo composter could employ 2 or 3 plastic barrels, locate them in a shed (outhouse) next to the home. Simply switch the input and suction tibes to the next barrel when one is half full.

Then the half full barrel can rest and complete the composting cycle for 6 months, making the waste clean, dry and easy to use to fertilize non-food plants like trees (just to be extra safe).

An automatic switch over system could even be rigged up copying the design in the shop vac that shuts it down when full.

For a permanent system a bermed in concrete tank could be built under the shed, serving as the floor that would form a basin to prevent any spills if the system malfunctions. A chimney could be used to bnoost airflow through the composting barrels.

Screens that allow the waste to filter down from top to bottom through gravity as the material composts and dries as in the Clivuus Miltrum device, could be installed in each barrel.

A seperate barrel ot two to catch urine from a separate front part of the toilet is good too. The urine will settle and evaporate with airflow through the chimney. It can be processed later, from the dry state into organic fetrilizer.

This is not as much of a hassle as it appears, manitenance would be needed every six months or so and could be handled by a service business rather than a homeowner, if that were prefferable.

It would be like the necessity of rural sewer pumping except that the material would be dry and safe, easy to suction into a truck mounted tanks with shop vac suction on the truck.

With bigger buildings like schools, large concrete bins could hold the composting apparatus. With a bigger truck coming around to collect the dry waste. Overall it would be much cheaper than rural swers or municipal sewers and treatment plants.

Property tax payers, sewer system rate payers, and rural homeoners and small businesses would save tons of cash. The systems would have a much, much lower initial cost and debt burden than multi 10 million dollar municipal systems and multi 10 thousand dollar rural sewers.

The water and cash savings would be ENORMOUS! And the squeamish could still flush. Problem solved....now get bucky's fog gun shower system for washing and cleaning and use a solar greenhouse water recycling/purifying setup...and even desert dwellers could live in comfort, cleanliness, and health, with almost no net water use.

As drought persists and glaciers melt, humanity is going to need solutions like this. Why aren't US companies manufacturing kits for these devices already? It's a huge world market waiting to be satisfied.