Review on PureHQ Keurig Starter Kit for Keurig 2.0 K200, K250, K35, K-Duo, and K-Compact Coffee Makers - Includes Filter Holder and 3-Pack of Keurig Compatible Water Filters by Omar Austin

This is the perfect size for the Keurig K-Duo. It's easy to install, comes with 3 filters, and is cheaper on Revain than Keurig! Before using any of the filters, make sure you soak them in warm water (I usually leave mine there for 15 minutes). Then rinse them thoroughly. These are activated carbon filters that work great, but if you don't soak them you'll end up with all that carbon black crap in your coffee. POOH! You do not want that! All in all a great buy at a reasonable price!