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The indication that sodasorb needs to be changed is primarily associated with a color change or reaching its expiration date. Sodasorb, a type of carbon dioxide absorbent used in medical applications, changes color when it becomes saturated with carbon dioxide. These color changes serve as a visual signal to users that the absorbent is no longer effective and must be replaced. Additionally, the expiration date provided by the manufacturer is critical, as it denotes the timeframe in which the product is guaranteed to function effectively.

Other factors like temperature fluctuations, weight increase, or unusual odors such as sulfur may affect the performance of sodasorb or indicate changes in the surrounding environment, but they are not reliable indicators for when sodasorb specifically needs to be replaced. The main focus should be on the color change and the expiration date for ensuring the effectiveness and safety of the respiratory care environment.