I actually emailed the company that makes reef crystals and asked them this question.
They said if sealed, it did not have a shelf life.
In other words, indefinitely.
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Enriched synthetic sea salt designed for use in reef aquariums
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Extra calcium, trace elements and vitamins to maintain a thriving reef system
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Eliminates the need for supplements & is compatible with all reef and fish-only aquariums
Enriched Reef Crystals Reef Salt is formulated especially for reef aquariums. Contains extra calcium, select trace elements, and vitamins above natural seawater concentrations. These extra measures reduce the need for constant supplements and additives to replenish essential substances quickly depleted in thriving reef aquariums. Reef Crystals also contains special additives to help detoxify excess heavy metals, such as copper, and is fully compatible with all marine aquariums.
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