Reaction time/min

pH

Calcium removal rate/%

Magnesium loss rate/%

1

7.8

90.41

0.02

2

7.8

91.48

1.88

3

7.8

97.38

2.04

4

7.8

98.43

2.23

5

7.8

97.56

2.23

1

8.0

91.32

0.15

2

8.0

94.56

1.35

3

8.0

97.66

3.37

4

8.0

98.98

3.26

5

8.0

98.21

4.05

1

8.2

93.96

0.00

2

8.2

96.65

0.00

3

8.2

99.04

1.98

4

8.2

99.28

4.23

5

8.2

99.19

60.61

1

8.4

94.15

0.02

2

8.4

97.48

2.96

3

8.4

99.38

75.56

4

8.4

99.43

77.04

5

8.4

99.56

78.23