AlgenAir offers a 60-day money back guarantee for unused aerium™ units still in their original condition and packaging. We also offer a 30-day Money Back Guarantee. If you are not satisfied with your aerium™ unit you can return it within 30 days of purchase as long as there is no damage or wear on the unit. Subscription service boxes and live algae are not eligible for refund. In both cases the return shipping charge will be charged to the customer. Please contact firstname.lastname@example.org with questions or to initiate your return.