Question

Passage:
Nuclear submarines rely on regenerative carbon dioxide ($CO_2$) scrubbers to maintain breathable atmospheric conditions during prolonged submerged operations. Ambient air is drawn continuously through beds of solid amine resin, which chemically bind $CO_2$ molecules at room temperature. Once a resin bed becomes saturated, the system automatically redirects incoming airflow to an alternate bed and exposes the saturated resin to steam heat and a vacuum, venting the desorbed $CO_2$ gas directly into the surrounding seawater. This cyclical thermal desorption allows the amine resin to be reused indefinitely without consuming consumable chemical cartridges. In contrast, older non-regenerative systems required manual replacement of disposable lithium hydroxide ($LiOH$) canisters, which generated hazardous solid waste and occupied valuable storage space.

Statement: According to the passage, modern regenerative carbon dioxide scrubbers require consumable chemical cartridges that must be manually replaced when saturated.