tender for inviting rates for supply of water purification material , inviting rates for supply of water purification material , bleaching powder grade - 1 minimum 34% available chlorine as per is code - 1065/1989 , lime (dingla ) for water treatment purpose as per is code specification , alum grade - 4 minimum 16% water soluble aluminium compound suitable for water purification for drinking purpose as per is code - 299/2012 , chlorine gas minimum 99.5% to 99.8% as per is code 646/2020 , thermax make maxfloc -t a liquid cationic polyectrolyte solution , supply of graded filter media , graded filter sand: hard, durable, clean quartz/silica sand free from clay and organic matter. conforming to is 17955:2023. effective size (es): 0.45 mm to 0.70 mm. uniformity coefficient (uc): 1.6. specific gravity: 2.5. acid solubility: 5%. , support gravel (fine grade): rounded quartzose pebbles/gravel. size range: 06 mm to 12 mm. free from shale and soft stone. acid solubility: 5%. , support gravel (medium grade): rounded quartzose pebbles/gravel. size range: 12 mm to 25 mm. conforming to mp phed specifications , support gravel (coarse base grade): rounded pebbles/gravel for placement above underdrains. size range: 25 mm to 50 mm.