corrigendum - supply of water purifying materials :-1 supply only of calcium based white to off white free flowing solid granulars chlorination chemical decomposing at 177 degree c, mol wt 142.98, toxicity : oral rat ld 50:850 mg / kg in 45 kg packing including loading, unloading and transportation complete all as specified & directed. 2 supply only chlorine testing kit with coloured ample complete with all testing fitments and ot solution in rexene finish box complete all as specified & directed. 3 supply of stable bleaching powder grade-i confirming to is-1065 / 1989 having chlorine content minimum 30% in 25 kg packing of pvc polyethylene bag having double fold including loading, unloading and transportation at water supply installations / stp / sewage installations at hisar mil station complete all as specified & directed by engineer-in-charge. 4 supply of alum ferric ( crystal type ) for purification of water confirming to is-299 / 1989 ( iv revision ) including loading, unloading and transportation complete all as specified & directed by engineer-in-charge . 5 supply of sodium hypochlorite confirming to is-11673 / 86, grade-i having chlorine content minimum 10% in sealed high density jar / containers of 50 kg capacity including loading, unloading at sewage treatment plant 2.0 mld / 0.24 mld / central sewage sump well no 6 at hisar mil stn and transportation complete all as specified & directed by engineer-in-charge.