What began as a school science project in Patna in 2018 has evolved into a startup tackling one of Bihar's biggest water challenges. Brothers Arpit and Abhijeet Kumar of Navmarg Research & Innovation have developed technology designed to remove arsenic and other heavy metals from groundwater, with pilots across schools and communities already underway. On Vande Bharatam, the young innovators pitch their solution, business model and plans to scale-and earn a 10-day mentorship opportunity with the Adani Group.