There is an expiration date on all BioCair products. An unopened Air Purifying Solution can be stored for 1 year. Once opened, it should be stored in a cool place that is not exposed to direct sunlight and used within 30 days.

Please be assured that all BioCair products are completely safe and do not cause any toxicity even after the expiration date. It can still be used past the expiration date, but the effectiveness might be limited.