The replacement columns for the Inogen Rove 6 and Inogen One G5 are designed to keep your oxygen concentrator working at its best. These metal columns, sold as a pair, contain the sieve beds that filter out nitrogen, turning regular air into the high-concentration oxygen you need. Over time, these sieve beds naturally wear out, which is why replacing them is essential to maintain optimal performance. Your device will alert you with a "replace columns" message, usually around the one-year mark, but it could be sooner depending on use. Swapping them out is straightforward and doesn't require any tools—just follow the step-by-step instructions.