Laboratory Investigations The Changes in Quality of Mandibular Bone Mineral in Otherwise Totally Immobilized Rhesus Monkeys

Method of introducing and circulating oxygen or air in liquid present in an activating basin of a clarifying plant, a surface rotor and a liquid impelling device circulate the liquid up the centre of the basin and helically down the sides. This prevents sludge settling at the bottom and ensures the air bubbles remain in the liquid a longer time than they otherwise would.