Effluent Treatment plant with ZLD Manufacturers and Suppliers in Gurugram. ECO PRO TECH is the largest Manufacturer of ETP & STP in Noida . . STP Manufacture and supplier using lattest tech. in Aligarh by ECO PRO TECH. Eco Pro Tech is the Manufacturer and Supplier of economical STP with MBR From Faridabad to Ghaziabad.