Maintenance and Operation of filter plants for water supply at KYO, GVR, KBY, TNL ( 2 plants), HRSN, ULG, RWTB, MJBT ( 2 plants), DKJR, NMM, RPAN (4 plants), BKTB, DKGN, TZTB, BVU, DQL, NCA, VNE, NBX, HML, GPZ, HMY, GMTO, NHLN, NLP ( 2 plants), LBI