Concluding Experiment

Okay, so I'll have these set-ups for my concluding experiment:

Variables:
1) pH- Low pH, Neutral pH, High pH
2) Concentration- Low Concentration, Recommended Concentration, High Concentration
3) Temperature- Low Temperature, High Temperature (Warm)

Set-ups:
1) Low, Low, Low
2) Low, Low, High
3) Low, Recommended, Low
4) Low, Recommended, High
5) Low, High, Low
6) Low, High, High
7) Neutral, Low, Low
8) Neutral, Low, High
9) Neutral, Recommended, Low
10) Neutral, Recommended, High
11) Neutral, High, Low
12) Neutral, High, High
13) High, Low, Low
14) High, Low, High
15) High, Recommended, Low
16) High, Recommended, High
17) High, High, Low
18) High, High, High
19) Control- Just leave aside

19 SET-UPS. THIS IS MADNESS.

Or maybe: Best Set-up VS Worst Set-up (?) I'm not sure how this is conducted though.