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Check to make sure the CD is delivering the correct multiple of 2 mg alum per liter plant flow at the respective notch. Expected alum flow rates at each notch are listed in the table below.

50

Notch from pivot

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

Alum Dosing (mg alum/L plant flow)

2

4

6

8

10

12

14

16

18

20

22

24

26

28

30

32

34

36

38

40

42

44

46

48

Expected alum flow rate (mL/min) at full plant flow

1

2

(2 mg/L * 700L/min)/120 g/L = 11.67 mL/min

2

4

23

3

6

35

4

8

47

5

10

58

6

12

70

7

14

82

8

16

93

9

18

105

10

20

117

11

22

128

12

24

140

13

26

152

14

28

163

15

30

175

16

32

187

17

34

198

18

36

210

19

38

222

20

40

233

21

42

245

22

44

256

23

46

268

24

48

280

25

50

292

If the CD is not dosing as much alum as expected, the FC outflow tubing may need to be shortened. Cut off small pieces of the tubing and re-check flow rate. Conversely, a high flow rate would mean that longer tubing is needed. Also make sure to double-check that the tubing is in fact 3/16" inner diameter. The table above is designed for 3/16"ID tubing that is 3.25 m long.