In a waterless situation, gravity is the only way to convey excrement and toilet paper from toilet to composter, so the composter must be almost directly under the toilet, although it can be several floors down. There should be few, if any, angles at all. Do not underestimate the viscosity (stickiness) of excrement.

If you cannot establish such a location or if you decide that aesthetic and life style issues dictate a barrier between you and the composter, a microflush toilet stool or a vacuum-flush toilet system are your alternatives.