India’s metropolitan cities are running dry due to environmental degradation. From Mumbai to Chennai, and Bengaluru to Delhi, water scarcity is no longer a distant threat. With borewells drying up, water tankers charging a premium, and piped supply struggling to meet demand, urban families are being forced to rethink how they use — and waste — water.

Amid this growing crisis, one Bengaluru resident decided to find a sustainable solution. Prabhat Vijayan, a 45-year-old tech manager living in Horamavu, watched as his RO purifier discarded litres of wastewater for every glass of clean water it produced. While most people let that water disappear down the drain, he saw it as an opportunity and acted on it.

Armed with a drum and a screwdriver, he built a simple system that now saves his household 24,000 litres of water each year.

What happens to RO wastewater?

Originally from Alleppey, Kerala, a place where water was once in abundance, Prabhat never imagined he would one day........

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