This is how it works:

The GROHE Blue CO2 bottles are available as starter kit and refill - consisting of four CO2 bottles of 425g:

First order one or more GROHE Blue Starter kits (article number 40422000, consisting of 4 bottles of 425 grams of CO2).

Once these bottles are empty, order the GROHE Blue Refill  (40687000) with your next order. Together with your order confirmation, you will receive a return label by email.
Please print the return label out and return four empty bottles free of charge at the nearest UPS Access Point. Once the empties have arrived at our warehouse, we will send you the refilled bottles. Please send us four empty bottles for each ordered refill.

A detailed description of this process can also be found at the bottom of this page. If you have any further questions, please do not hesitate to contact us by phone or e-mail.