Today Kali Bein, sacred to the Sikhs for its association with Guru Nanak Dev, flows clean and proud. But it was not like this a couple of years ago. The stream emerges from a spring near Hoshiarpur, flows through Kapurthala and Sultanpur Lodi, to meet the Sutlej near Harike Pattan. On the way, it gathers industrial waste and sewage from all the towns it meanders through. The Bein was choked with weeds, particularly water hyacinth, to such an extent that at Sultanpur Lodi the water wasn’t even visible.