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Dry loos can save up to 40l of water each day, and are surprisingly hygienic. The makers now hope to take the business a step further and use collected waste as natural fertiliser.

Black forestBaden wübergOlaf scholzMarco kreftingMichael heizmannFriedensreich hundertwasserFridolin einwaldEuropean unionEnvironment ministryBauhaus university in weimarGermany environmental ministryBauhaus universityEnvironmental ministryGerman chancellor olaf scholzComposting toiletHuman waste