After cleaning and inspecting each valve on the capsule, each Carbon Capsule is sealed with a sticker at our facility. We recommend keeping those stickers on the capsules until you are ready to use them.
Sticker = new and unused capsule.
No sticker = used capsule.
Simply return your Carbon Capsules to the refill pack as soon as they are empty to keep track of them. Once all of your capsules are used, you're ready to pack it up and send it back for your next refill pack!