procurement of water purifying additive for wd-i , w/s scheme of pwd . iii ( d . p . ) , d and n . h . silvassa for the year 2019-2020-2021 ( 1st call ) , supplying of sodium hypochlorite solution ( chlorite solution ) with drug license as per is - 11673 - 1986 grade i . u . s . p . in 25/20 lit . packing including maintenance of all accurate chlorination system fitted at various water supply scheme and spare one person for all time to maintain the chlorination system at different places in u . t . no any extra labour charges will be paid for maintenances . , supply of bleaching powder in 25 kg . packing bears following characteristices as per are 1065: 1989 . requirement method ofgrade 02 testi . available chlorine percent by mass minimum 32 . 0 a-2ii . stability loss of chlorine on the basis of 1/11 a-3 initial available chlorine max . iii . misture percent by mass , max . 0 . 50 a-4iv particle size ( passing through 1 . 70 mm is 99 . 00 a-5 sieve ) precent by mass , minimum . , supply of alum ferric is 299 : 1989 grade iinsoluble matter , ( percentage by mass max ) 0 . 50soluble iron compound ( percentage by mass max ) 0 . 70water soluble aluminum ( percentage by mass max ) 16 . 00 compound ( alco 3 ) ph ( 5% acqueas solution ) minimum 2 . 70basicity as a1203 ( percenttage by mass max ) 0 . 5 , supply of 900kg . chlorine tank for water treatment plant at silvassa , including transportation , loading and unloading .