The Berkey PF-2 Fluoride Water Filters are designed for use with Berkey systems and are sealed in a new box. These white plastic filters are compatible with Aqua Optima systems and are intended for commercial and household use. With a carbon block filtration method and two stages of filtration, these filters are capable of removing fluoride contaminants from your water supply. Each filter has a capacity of 4.5 gallons and comes in a pack of two, making them suitable for regular use in your kitchen or dining area.