procurement of chemicals procurement of chemicals such as ferric alum grade_iv and bleaching powder gr i for supplying treated water from various filter units at chouldari and humfrygunj section under sub division no iv phed, during 2025_26 , supplying of alumino ferric alum grade- 4 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-0.2 2) soluble iron compound (as fe), percent by mass, max-0.04 3) water soluble aluminium compound (as al2o3), percent by mass, min-16 4) ph (5% of aqueous solution), min-2.7 5) free acidity (as h2so4), basicity (as al2o3), percent by mass, max-0.5 6) lead (as pb), ppm, max-20 7) arsenic (as as2o3), ppm, max-4 8) mercury (as hg), ppm, max-0.4 9) manganese (as mn), ppm, max-20 10) chromium (as cr), ppm, max-20 11) cadmium (as cd), ppm, max-4 12) selenium (as se), ppm, max-4 13) organic impurities: a) phenolic compounds (as c6h5oh), ppm, max-0.4 b) aniomic detergents (as mbas), ppm, max-80 materials to be supplied at water treatment plant, chouldari& humphrygunj. , supply of bleaching powder grade-i conforming to is 1065:1989 (reaffirmed 2003) suitable for chlorination of drinking water packed in hdpe drumis 50 kg for the protection during transit. the packages used shall be free from dirt or other foreign materials which are likely to cause decomposition of stable bleaching powder (each drum containing 50 kg quantity) material to be supplied at water treatment plant, chouldari & humphrygunj.