Returning empty canisters to get discounted refills is easy.

Order 2 spare CO2. 1 canister comes with your Thirsti. Order 2 spares so you have 3 total.
Refill empty CO2. Place 2 empty canisters into the provided refill box.
Mail. Stick the shipping label to your refill box and mail via USPS.
Refill club. We'll automatically send you 2 new canisters to your door.
Use. Carbonate up to 60L per canister.

How to get more CO2
Never be without bubbles with our refill club.

Additional canisters are sent with a reusable box and prepaid shipping label so you can save by only paying for the refill on future exchanges.

100% renewable CO2 and reusable canister. Carbon dioxide derived from renewable biomass in the USA.