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Learn how to replace columns for the inogen one g3 portable oxygen concentrator. Replacing the molecular sieve oxygen concentrator columns is part of the routine maintenance required for. These two columns will be. How to replace inogen one g3 columns? Learn how to replace the columns (sieve beds) of the inogen one g4 portable oxygen concentrator.buy inogen g4 columns:. How to replace inogen one g3 columns. American medical sales and rentals. There are two columns (metal tubes) in the concentrator located behind the particle filter.