The State of Michigan equipped five state fish hatcheries with pressure swing absorption oxygen generators and sealed columns for aeration and degassing. Sealed columns can increase dissolved oxygen levels to far above saturation without exceeding total gas pressures. Many variables affect column performance, and best efficiency in performance is not necessarily the best economically. Column design and operational characteristics have been delineated but not firmly established. Formulas are presented to determine absorption efficiencies, oxygen flow requirements, and capacities of pure oxygen systems for facilities. Fine-tuning of the existing design is needed along with continued development of systems to introduce pure oxygen into solution under a variety of aquaculture operations.