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)

-

90.8

94.6

95.9

93.7

84.1

% of Turbidity reduction (sample B)

-

81.3

87.4

95.2

94.8

93.8

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)

-

89.7

93.5

96.5

91.2

87.7

% of Turbidity reduction (sample B)

-

92.5

95.7

97.5

94.8

83.4

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)

-

87.5

87.7

92.9

94.1

84.3

% of Turbidity reduction (sample B)

-

80.1

88.5

93.8

97.5

94.0