It holds water unlike any other bathtub. It looks like no other grey water system. It’s beautiful. The secret reservoir hidden within this bathtub is what makes it different. The cavity of the shelled structure holds roughly 200 litres of water, approximately the same amount of water used to flush the toilet in a 24 hour period. It is built to fit within standard dimensions and uses conventional construction techniques. This bathtub is a grey water system that is designed for urban environments where space is a valuable resource. A system like this allows people to save water in ways where it was once physically prohibitive.