supply of chemicals for the use of water treatment plant of mil stn masimpur under ge silchar - 1 supply only alumino ferric ( ferric alum ) grade-4 confirming to is-299-2012 with additional requirements for purification of water, containing lead ( as pb ) 20 ppm max and arsenic ( as as2o3 ) 4 ppm max all as specified and directed by engineer-in-charge. nmake:-approved make of e-in-c / ceec / cesz or equivalent make with isi marked approved by ge. nnote: test certificate and analytical report from manufacturer with batch number shown in purchase voucher shall be submitted by the contractor for each consignment of material supplied from the manufacturer or authorised dealer n n n 2 supply only alum ( ferric alum gde-i ) complete all as specified conforming to bis -299 - 1989 ( 4 th revision ) nmake:-approved make of e-in-c / ceec / cesz or equivalent make with isi marked approved by ge. nnote: test certificate and analytical report from manufacturer with batch number shown in purchase voucher shall be submitted by the contractor for each consignment of material supplied from the manufacturer or authorised dealer n 3 supply only calcium based granular ( calcium-hypochlorite granules-altoch-ch ) disinfect for treatment of water having chlorine content 65% to 70% in sealed drum in 45 kgs nmake : isi marked duly approved by ge. nnote: test certificate and analytical report from manufacturer with batch number shown in purchase voucher shall be submitted by the contractor for each consignment of material supplied from the manufacturer or authorised dealer n 4 supply only bleaching powder of grade -i conforming to is-1065-1989 ( 2nd revision ) minimum markable chlorine 33.5% by mass packed in hdfc bag of 25 kg capacity isi marked complete all as specified. nmake:-approved make of e-in-c / ceec / cesz or equivalent make with isi marked approved by ge. nnote: test certificate and analytical report from manufacturer with batch number shown in purchase voucher shall be submitted by the contractor for each consignment of material supplied from the manufacturer or authorised dealer 5 supply only hydrated lime ( eatable ) ca ( oh ) 2 of purity 90% and conforming to is 1514-1990 complete all as specified. ( for water supply treatment ) . nmake:-approved make of e-in-c / ceec / cesz or equivalent make with isi marked approved by ge. nnote: test certificate and analytical report from manufacturer with batch number shown in purchase voucher shall be submitted by the contractor for each consignment of material supplied. 6 supply only orthotolodine solution of 500 ml bottle complete all as specified. nmake:-approved make of e-in-c / ceec / cesz or equivalent make with isi marked approved by ge. nnote: test certificate and analytical report from manufacturer with batch number shown in purchase voucher shall be submitted by the contractor for each consignment of material supplied from the manufacturer or authorised dealer