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If you think of this project as a way of doing a DIY version of an Aqus Toilet, you'd be mostly right. These are also commercially popular in Japan.
The goals of our project were: conserve drinkable water by eliminating the use of clean, potable water to flush toilets; break down social stigma around toilet water pre-use; build awareness of creative water conservation; make toilet modification replicable, accessible, and affordable to low income households; and conserve water at CCAT.
We thought about the fact that clean, drinkable water is being used to flush human waste down the toilet. We consider this to be environmentally and socially irresponsible. Therefore, we took action.