To trap the insects, the upper end of the pipe is equipped with a small mesh wire, so that the insects can neither escape nor fly back into the pit. The superstructure can be of any shape or any building material. Having no direct wall connection to the slab also means no 90 degree corners between slab and wall for dirt to settle or water to attack the building material. If a roof is installed, space for ventilation should be left between the walls and the roof. Circulation can be guaranteed with no direct connection of walls to either cover slab or roof.
Good circulation is essential for a comfortable environment inside the latrine.
Helpful for achieving proper cleanliness is provision of ample natural light inside of the superstructure, while keeping the pit itself dark. Apart from cleanliness, it is of importance to note the filling level of the pit. Once it has reached a level of 4 feet under the cover-slab, the use of the pit latrine should be stopped. In case of a simple earth dug pit, an alternative pit should be prepared for use. The cover slab and the superstructure can be shifted.