procurement of calcium chloride, sodium meta bisulphite, bwro antiscalant. , calcium chloride anhydrous as per is 1314/1967 1.appearance: material should be in anhydrous powder form free from extraneous impurities 2. insoluble matter : max 0.05% by mass 3. calcium chloride (as cacl2): min 96% by mass 4. ph of 5% solution at 25 deg c: 7.0 – 8.5 5. alkalinity ( as ca(oh)2: max 0.02% by mass 6. chlorides (as nacl): max 1.6% by mass 7. heavy metals ( as pb): max 0.005% by mass the material should be well packed 25/35/20 kgs of water proof bags and labelled with specification. , sodium meta bisulphite technical grade as per is 4752 purity (as so2)% by mass min – 64% purity (as na2s2o5) % by mass min 95% , hbwro antiscalant quality of water – swro permeate, temp-20? - 32? ., tds – 600 mg/lt, permeate, tds<50 mg/lt, sdi<3