tender for procurement of ferric alum for pre-treatment plant of wtp, dtps htps, kasimpur. , ferric alum grade-ii conforming to is: 299/1989 (4th revision or as per latest amendment, if any) having following specification. a-aluminum sulphate octadecahydrate. it shall be in the form of slab of 20kg (approx.) b-insoluble.0.5% by mass (max.) c-soluble iron compound (as fe):0.7% by mass (max.) d-water soluble aluminum compound as al2o3:15% by mass (min.) e-lead (as pb):30ppm (max.) f-arsenic (as as2o3):6ppm (max.) g-ph of 5% aq.soln.2.7 (min.) h-acidity (as h2so4) 0.5% by mass (max.)h-acidity (as h2so4) 0.5% by mass (max.)