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(I disagree with your conclusion here. I do not see a large statistical difference for influent water here. Can you speculate as to why there was less change here? Is it because the tube settler is already in the floc blanket and this experiment did not reflect acutal conditions because some air bubbles would go through the system but not perturb performance locally in the tube settler? It is possible that saturated air had little effect and there was a problem with another problem in the experiment causing the worsened performance at the beginning? Also, why was performance significantly worse for 5 m/day saturated compared to 10 m/day? Let's look at the data and add error bars to see if this is consistent with what we would expect or if there was a large pertubation over a small period of time.)