Berkey PF-2™ reduction elements are designed for use in conjunction with Black Berkey™ water purification elements to adsorb the following unwanted elements found in drinking water.

• Fluoride
• Arsenic V and pre-oxidized Arsenic III
• Other residual heavy metal ions

REPLACEMENT:
Under normal conditions it is recommended that each set of two Berkey PF-2™ elements be replaced after 1,000 gallons (3,785 liters). The Royal Berkey™ system is about 3.25 gallons (12.3 liters) therefore the Berkey PF-2™ filters should be replaced after 1,000/3.25 (3,785/12.3) or 307 refills. If the system is refilled about one time per day, the Berkey PF-2™'s should be replaced after 10 months, if the system is refilled about twice per day, the Berkey PF-2™'s should be replaced about every five months). Actual capacity is dependent on the presence of other competing contaminants in the source water. High levels of fluoride, arsenic and heavy metals may reduce the capacity and efficiency of the elements.

ps: If you use 4 Black Elements at a time in your Big Berkey or Royal Berkey  you will need 2  PF-2 units, which go underneath the Black Elements.