Introduction: Open-Source Dry Toilet (Banheiro Seco Open-Source) 4.0
Warning: You are required to have knowledge on composting techniques before trying to build/use this toilet.
Features: UDDT (Urine-Diverting Dry Toilet); this project does not need a special UDDT cover; reuses space of existing regular toilet; urine is not collected; external hand urinol (optional); based on version 3.0 without the Separett piece.
Pros: reuses space of existing toilet, no need for extra space; collects urine for treatment ou use as biofertilizer; provides urinol for men; saves water (no flush needed).
Cons: urine storage for many days can cause extremely bad smell; not very simple to remove the urine container (this would require a door in the structure);
Note 1: you can use either the biodegradable bag or a bucket (10L). The recommendation is to use a bucket, because it is easier to remove/replace. In that case the structure needs to be a bit higher (about 5cm higher if you use a 10L bucket).
Note 2: to make it easier to remove the urine container it is recommended to include, in one of the sides or in the front, a small door.
Note 3: The piece of rubber balloon in the tip of the hose helps to prevent urine smell from coming back up through the hose.
Note 4: Instead of using recycled plastic (6mm thick), the structure can be made of plywood (1cm thick) .