This image shows tank one after 24 hours. You can see how much foam this tank had on day one, and the foam got higher for three more days before it went down. The tanks are clearing more as the bacteria come out of the resting cysts.

You can see how the airlift pump works. We now make the hole in the pvc elbow a bit larger than the air tube. This way we can remove the airline to clean the plugged end of the tube. We need to clean each airlift once a week, because of mineral build up.