Maintenance and Operation of filter plants for water supply at PNVT, GLPT (2 nos), KRNI, DDNI, AMGA, RGJI, DPRA, BOKO, SNCA, BMGN, CGON, MRZA, AZA, MNDP & NOLB by engaging skilled, un-skilled labour (Total = 16 plants) under the jurisdiction of ADE