Physical and chemical

parameters

Raw

water

Chemicals added

Ca(OH)2

NaOH

Physical properties

T = 25C; TDS = 40 mg/L; I = 0.001

pH

7.2

9.0

9.0

Calcium mg/L as CaCO3

40

45

40

Alkalinity mg/L as CaCO3

42

47

47

Acidity mg/L as CaCO3

47

42

42

C2 mg/L as CaCO3

2

2

7

pHs

8.60

8.45

8.50

Saturation state

under

over

over

[Ca]sat mg/L as CaCO3

-

40

36

CaCO3 precip. potential

−4

5

9

Langelier’s index

−1.4

0.55

0.50