Hi,
With my Artesian, whenever I change the water, the pumps get air-bound and I found that this works. Turn one pump on at a time, almost as soon as you press the button for the pump, press again to shut off. do this several times, you are just "bumping pump over". This way, I purge all the air out of the pumps and it only takes a few "bumps" of each pump for it to work
good luck
john