Tender For supply of alumino ferric with additional requirements for purification of water, grade -4, isi marked conforming to is: 299:2012 with amendment no.1 with additional requirements for purification of water containing lead (as pb) 20 ppm. max. and arsenic 4 ppm max. [ warranty period: 30 months after the date of delivery ][quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitted: max 8 lacs ] ]