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?

Treated effluent

Water leaving a toilet-waste treatment system (a septic tank, a reed bed) once it has been treated. It goes back to the ground or a watercourse, and in some systems to irrigation.

Produced by

• Constructed wetland / reed bed filtration
• Sand filter
• Septic tank + drain field
• Constructed wetland blackwater treatment
• Membrane bioreactor (MBR) greywater recycling package unit
• Wood-chip filter (Filtres a Broyat de Bois, FBB)
• Aerobic treatment unit / micro-station d'epuration (package plant)

Consumed, transformed by

• Subsurface irrigation reuse
• Permitted discharge to soil/drainage field
• Low-flush toilet