Revamping of pressure sand filters in water treatment plants & sewage treatment plant at IIST, Valiamala Tender Number: IIST/CMD/ 3-2548/E-38 Dated 18.11.2025 Opening Date & Time: 11 Nov 2025 - 14:00 Last Date & Time: 5 Dec 2025 - 23:59 Download Tender File