The BOROUX Proactive Fluoride Filter is a high-performance, alumina-free solution that removes up to 99% of fluoride. Its patent-pending upflow design and dual-layer nano-carbon filtration maximize contact time and filtration efficiency. Housed in durable stainless steel shells, it’s compatible with BOROUX Foundation and Black Berkey® filters, delivering up to 1,000 gallons of clean, fluoride-reduced water per pair. The fluoride filter is an add-on filter located in the lower chamber and must be attached to a filter housed in the upper chamber.