Wasted: Foam toilets convert human waste into fertilizer for plants

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To fertilize plants, Santa Monica’s new City Hall East building uses human waste processed as compost by “foam-flush” toilets. Photo by Amy Ta.

Santa Monica’s new City Hall East structure uses solar energy and captures rainwater. But the showstopper? It uses “foam-flush” toilets that turn human waste into nutrient-rich compost for the garden on site. But that makes some employees a little uncomfortable.