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Design and test results.
| Factor |
Observed pH (milli-pH units) |
|||||||
|---|---|---|---|---|---|---|---|---|
| A | B | C | D | E | F | G | ||
| 30 | N | N | 3 | N | N | 5 | 2904 | 2895 |
| 30 | N | Y | 3 | Y | Y | 10 | 3015 | 3017 |
| 30 | Y | N | 1 | N | Y | 10 | 3006 | 2990 |
| 30 | Y | Y | 1 | Y | N | 5 | 2964 | 2935 |
| 25 | N | N | 1 | Y | N | 10 | 2999 | 2983 |
| 25 | N | Y | 1 | N | Y | 5 | 3055 | 3053 |
| 25 | Y | N | 3 | Y | Y | 5 | 3049 | 3044 |
| 25 | Y | Y | 3 | N | N | 10 | 2949 | 2949 |
| Average | 2993 | 2983 | ||||||
