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

pH_s

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