Ravi Iyer’s home is surrounded by a bright green garden and lawn even at the peak of summer. Plantains and other trees, flowering plants and creepers thrive here. Located along Sarjapur Road, Iyer’s layout gets no municipal water supply at all. For years, he had used tanker water for all purposes, including gardening. Then around 2014 he installed a greywater treatment system – the treated water from the system feeds the garden now.