Was at a newer hotel over Thanksgiving and noticed some nice small bubbles and a small spray comming from a return going out about 3'. At first I thought it was just coincidence the "low speed" on the returns were working out to do this, but by curiosity I found another jet and no water was flowing there. Is there such a thing as automated aeration and they were trying to adjust Alkalinity? Can a regular pump be ran this way with a frequency drive to do to go this slow? I did not see anything special with this jet or the non-functioning one.