bids are invited for ferric alum grade - iv - supplying of ferric alum grade-iv in solid form for treatment of water intended for drinking conforming to is: 299: 2012 ( fifth revision ) having following requirements:1 ) insoluble matter, percent by mass, max-0.22 ) soluble iron compound ( as fe ) , percent by mass, max-0.043 ) water soluble aluminium compound ( as al2o3 ) , percent by mass, min-164 ) ph ( 5% of aqueous solution ) , min-2.75 ) free acidity ( as h2so4 ) , basicity ( as al2o3 ) , percent by mass, max-0.56 ) lead ( as pb ) , ppm, max-207 ) arsenic ( as as2o3 ) , ppm, max-48 ) mercury ( as hg ) , ppm, max-0.49 ) manganese ( as mn ) , ppm, max-2010 ) chromium ( as cr ) , ppm, max-2011 ) cadmium ( as cd ) , ppm, max-412 ) selenium ( as se ) , ppm, max-413 ) organic impurities:a ) phenolic compounds ( as c6h5oh ) , ppm, max-0.4b ) aniomic detergents ( as mbas ) , ppm, max-80materials to be supplied at water treatment plant, garacharma. total quantity : 1