starch iodide method

orthotolidine method

both starch iodide method and orthotolidine method

none of the above

dissolved oxygen

residual chlorine

biochemical oxygen demand

dose of coagulant

total alkalinity

total hardness

total hardness - total alkalinity

non carbonate hardness

0.01 to 0.05 ppm

0.05 to 0.5 ppm

0.5 to 1.0 ppm

1.0 to 5.0 ppm

1 mg/litre

10 mg/litre

100 mg/litre

1000 mg/litre