The BOROUX Automatic Filter Primer simplifies the priming process for BOROUX filters, transforming a tedious task into a quick and effortless 90-second process. The Automatic Filter Primer is compatible with the BOROUX Foundation Filter, Proactive Fluoride Filter, and Black Berkey® Replacement Elements. On a full charge, the Primer works for a minimum of 10 filter priming cycles. Quickly and efficiently prime your filters with no need for the correct-sized faucet or risk of getting sprayed. The filters fit into the Primer, press a button, and voilá! Enjoy clean, clear water from the very first use.