Ratio Kone Coffee Filter
Since 2015 Ratio has collaborated with Able on a custom Kone permanent filter for the Ratio 8 designed specifically to optimize extraction of a full batch of coffee. Able has continued to refine the design of the Kone, and in 2020 released a new version. The new Kone brews better, is easier to clean and more durable than ever. Works especially well with Ratio glass carafe and Chemex glass carafe.