The Splitter-Wizz Carbonation Box allows you to use two stones in one tank at the same time and was designed to speed up the carbonation process. This is a custom order product depending on what size stones you are planning to use. If you are using two 12" stones (or smaller) this option will work for you. If the stones you are using are 6" to 12" you will need a 22 CFH flow meter installed on your FizzWizz unit. You may also need another Stone Adaptor Kit for the second stone if you don't already have one. This is designed to work with FizzWizz Bubbles Anywhere Edition. If you have a FizzWizz V1 you will need to contact firstname.lastname@example.org to place an order.