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

5 to 10 cm/sec.

15 to 30 cm/sec.

15 to 30 cm/minute

15 to 30 cm/hour