Mumbai (Maharashtra) [India], October 18 (ANI/PRNewswire): STL(NSE: STLTECH), one of the industry's leading integrators of digital networks, today announced that 100 per cent of its Indian manufacturing facilities are now Zero Liquid Discharge (ZLD) certified by Deutsch Quality Systems (DQS India). This is a great milestone for STL in its UN SDG goal of attaining 'Water Positivity by 2030'.