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http://www.vermicompostingtoilets.net/

This site is about vermicomposting flush toilets – on-site processing of domestic sewage with worms. These aren’t the first vermicomposting sewage systems by any means, but they’re the first (to our knowledge) to be based on open source principles with non-proprietary technology and low cost components, many of which can be sourced from existing waste streams.

The method was designed and pioneered by Anna Edey in the USA in the mid 1990s and modified by Wendy Howard in Portugal 20 years later. Wendy constructed a simplified version of Anna’s system on her farm and, together with local architect Vera Filipa Rocha, introduced her local municipality to the concept. These toilets are now being installed and retrofitted in Central Portugal and beyond, with the first municipally-constructed system commissioned in the village of Pai das Donas in July 2016.