Annual Maintenance estimate of " Supply and delivery of lead Washers for fixing of liquid chlorine cylinders at various WTPs, MBRs and service reservoirs of HMWSSB, Ammonia Solution for identifying of chlorine gas leakages, chlorine tablets, essential material and safety equipments for the use of Central Chlorination Cell, A.F Beds, Sub-division No.I for a period of Two (2) Years under QAT Wing, HMWSSB