Sampling site

Total

hardness (mg/l)

Turbidity (NTU)

TDS (mg/l)

pH

Na+

(mg/l)

K+

(mg/l)

Mg2+

(mg/l)

PO 4 3 −

(mg/l)

NO 3 −

(mg/l)

Ca2+

(mg/l)

OF1

44 ± 5.28 a

0.6 ± 0.31 b

49 ± 3.12 b

6.8 ± 0.06 a

6.3 ± 0.13 a

1.3 ± 0.06 a

0.9 ± 0.13 a

11.1 ± 0.58 a

0.07 ± 0.007 b

6.0 ± 0.52 a

OF2

25 ± 6.10 b

2.5 ± 0.46 b

70 ± 2.73 a

6.6 ± 0.02 b

5.0 ± 0.33 b

0.7 ± 0.13 b

0.5 ± 0.15 b

5.8 ± 0.18 b

0.10 ± 0.006 a

6.3 ± 0.59 a

OF3

33 ± 3.45 ab

4.8 ± 0.42 a

69 ± 4.33 a

6.8 ± 0.11 ab

4.2 ± 0.26 b

1.2 ± 0.18 a

0.6 ± 0.08 ab

9.9 ± 0.44 a

0.08 ± 0.006 ab

7.5 ± 0.65 a

Acceptable value

5*

1000†,‡

6.5 - 8.5†,‡

50†