Table 3: Response surface methodology experiment design for filtrating time and response.

No.

X11

X12

X13

X14

Y1

1

240

30

10

30

31.63

2

200

30

10

30

51.80

3

240

10

10

30

8.95

4

200

10

10

30

35.83

5

220

20

15

40

36.95

6

220

20

5

40

32.55

7

220

20

15

20

30.47

8

220

20

5

20

24.12

9

220

20

10

30

32.22

10

240

20

10

40

25.11

11

200

20

10

40

48.07

12

240

20

10

20

13.17

13

200

20

10

20

41.30

14

220

30

15

30

41.56

15

220

10

15

30

25.49

16

220

30

5

30

34.74

17

220

10

5

30

19.68

18

220

20

10

30

31.89

19

240

20

15

30

28.41

20

200

20

15

30

49.75

21

240

20

5

30

22.74

22

200

20

5

30

43.46

23

220

30

10

40

38.87

24

220

10

10

40

24.68

25

220

30

10

20

32.67

26

220

10

10

20

14.80

27

220

20

10

30

33.90