One Shared Treatment Facility for the Entire Industrial Cluster.

Industrial clusters — textile parks, pharmaceutical zones, leather estates, food processing areas — generate combined effluent from dozens or hundreds of contributing units, each with different compositions, flow rates, and discharge patterns. A Common Effluent Treatment Plant (CETP) addresses this at cluster level: one engineered facility handles the combined wastewater of all contributing industries, achieving compliance that no individual unit could cost-effectively achieve alone.

GSI has designed, built, and operates some of India's largest and most technically demanding CETPs. The Narol Textile CETP in Ahmedabad — at 1,00,000 KLD — is the largest in India. GSI took over operations in 2019 when the plant was non-compliant, streamlined all four batteries within 90 days, reduced chemical costs from ₹1 Cr/month to ₹10 L/month, and saved 14,000 kWh/day of energy. The Supreme Court, NGT, IIT Bombay, NEERI, JICA and GIZ have acknowledged GSI's performance at this installation.

CETP projects require specialist experience in combining variable-quality effluent streams from multiple sources, managing peak flow variability, and maintaining compliance across a facility that no single contributor controls. GSI brings 30+ years of this specific expertise.