Periodical Mechanical Cleaning / Disinfecting Of Pvc / Rcc Overhead Water Tanks, Rcc / Masonry Underground / Semi Underground / Surface Level Water Sumps In Cmx And Ntb Compound Oht 3 Times Only And Ug Sump Once In Six Monthsfor The Year 2025-26 32/Eec/Bsnl/Cd/Bgl/2025-26