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Good read: Urban Fish Ponds: Low-tech Sewage Treatment for Towns and Cities
by Aaron Vansintjan
LOW←TECH MAGAZINEUrban Fish Ponds: Low-tech Sewage Treatment for Towns and CitiesIn the mid 20th century, whole cities’ sewage systems safely and successfully used fish to treat and purify their water. Waste-fed fish ponds are a low-tech, cheap, and sustainable alternative to deal with our own shit – and to obtain high protein food in the process.