O-GEN series oxygen generators extract the available oxygen in the ambient air from other gases by applying Swing Pressure Swing Adsorption (PSA) technology. During the PSA process, compressed, purified atmospheric air is passed through a molecular sieve column, which allows oxygen to pass through as a product gas, but adsorbs other gases. The sieve releases the adsorbed gases into the atmosphere when the outlet valve is closed and the column pressure returns to ambient pressure. The column will then be cleaned with oxygen before fresh compressed air is introduced for a new production cycle. In order to ensure a constant product flow, O-GEN oxygen generators use two molecular sieve column units, which alternate between the adsorption and regeneration phases. Under normal operating conditions and with proper maintenance, molecular sieves will have an almost indefinite lifetime.