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How long can silica gel desiccant be used?

The shelf life of silica gel desiccant is 24 months, but it can be recycled. If the discolored silica gel is blue when there is no water, it turns pink after absorbing water and turns pink after drying, it can be used again. If the colorless particles do not have color change function, they can be used after drying for a period of time, but there is no color change reminder.