PH = 5

Beaker No.

1

2

3

4

5

6

Alum Conc. (mg/l)

0

10

15

20

30

40

% of Turbidity reduction (sample A)

-

40.6

68.0

90.9

89.2

65.1

% of Turbidity reduction (sample B)

-

54.4

72.3

80.0

71.3

68.3

PH = 7

Beaker No.

1

2

3

4

5

6

Alum Conc. (mg/l)

0

10

15

20

30

40

% of Turbidity reduction (sample A)

-

93.4

94.8

95.3

94.2

94.1

% of Turbidity reduction (sample B)

-

91.2

91.6

94.3

87.6

81.3

PH = 9

Beaker No.

1

2

3

4

5

6

Alum Conc. (mg/l)

0

10

15

20

30

40

% of Turbidity reduction (sample A)

-

91.8

93.0

93.7

95.4

91.2

% of Turbidity reduction (sample B)

-

85.3

89.0

89.2

94.9

93.8