If the diameter of the connecting pipe for your toilet is too large, odors are most apt to enter the toilet room, insects have better access to the composter, and pets, toys, and infants could fall in (although we have yet to hear of a child falling into a composting toilet system).

• If the pipe diameter of your connecting pipe is too small, the pipe gets caked with excrement and might discourage ventilation/exhaust and require frequent cleaning. A good size is 8 in. to 12 in. (203 to 305 mm).
• Just check the outlet dimensions, so that you can get the necessary adapters to connect the toilet to the composter you have selected.