Lowtech Graph lists low-tech options for every need of a home. Here you can compare them, find tutorials to build them, and link them together into a circular system. Why low-tech?
Passive
Note: Cost, carbon and footprint are broad judgements against comparable building approaches, not measured figures.
The U-bends under every sink and toilet, which always hold a little water, and a vent pipe that rises above the roof. The water in the bend blocks sewer smells from coming back up, and the vent lets gases escape outside. The house stays free of drain smells.
none
The only option catalogued for this need so far, so there is nothing to compare it against.
We don’t list sizing or quantities, as the yield of each technique depends on the quality of its build. The catalogue compares options but doesn’t dimension them. Regulatory notes are indicative, with a French example, and need to be confirmed locally.