sulphuric acid

copper sulphate

lime

sodium permanganate

dissolved organic substances

dissolved solids and dissolved gases

floating solids and dissolved inorganic solids

bacteria and colloidal solids

50 to 60

100 to 150

500 to 600

1400 to 1500

0.25 to 0.35 mm

0.35 to 0.60 mm

0.60 to 1.00 mm

1.00 to 1.80 mm

(i) and (ii)

(ii) and (iii)

(i) and (iv)

(ii) and (iv)