PF-2 Fluoride and Arsenic Water Filters (2) - Fits Black Berkey Filters Only

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Installed in the lower chamber of the Berkey Water Filter, a set of PF-2 arsenic and fluoride water filters are designed for use in conjunction with 2 Black Berkey water purification elements ONLY to adsorb the following unwanted elements found in drinking water:

  • Fluoride - Sodium Fluoride, Sodium Fluorosilicate, Fluorosilicic Acid (aka Hydrofluorosilic Acid)
  • Arsenic V and pre-oxidized Arsenic III
  • Other residual heavy metal ions
  • Set of 2 Fluoride filters repalced every 1000 gallons

Note: Number of PF-2's must match the number of black berkeys working in upper chamber. ex: 4 Black Berkeys (2 sets of 2) would require 4 PF-2's (2 sets of 2), etc.

Note: The PF-2 shell is made from safe, non-leaching Polypropylene #5, that is BPA-Free and is used for food items such as ketchup bottles and yogurt containers.


PF-2 Fluoride and Arsenic Water Filters (2) - Fits Black Berkey Filters Only

Berkey Reviews




Testing for fluoride was based on 20-30ppm of the ion in the influent aqueous solution at a flow rate of no more than 3 gpm (11 lpm) per cubic foot of media.

  • PF-2 arsenic and fluoride water filtration results of < 1ppm of the fluoride ion in the effluent were typical for the media. >95% reduction
  • Under optimum conditions, effluent concentrations of less than 50 ppb were readily achieved; >99.75% reduction
  • Sodium fluoride, sodium fluorosilicate, and fluorosilicic acid (aka hydrofluorosilicic acid) all dissociate (breakdown) to fluoride, sodium, and silicate ions once added to water.
  • This PF-2 media filters any type of inorganic fluoride salt ions that are added to the water.
  • More Details on Fluoride/Arsenic Filter Testing and Media Specifications


This product uniquely targets the entire family of arsenic oxide anions as well as the arsenic cations.



Under normal conditions it is recommended that each set of two 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 PF-2 arsenic and fluoride water 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 PF-2's should be replaced after 10 months, if the system is refilled about twice per day, the PF-2's arsenic and fluoride water filters 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.

Read more


PF-2 Filter NOTES:

  1. Do not boil this element.
  2. PF-2 arsenic and fluoride water filters reduce filtration flow rate by 15-20%.
  3. The media used in the PF-2 filter elements contains high-grade activated aluminum oxide, which currently is the most efficient media available for extracting fluoride from water. Ideal water filtration conditions: 5-7 PH. Below are the results we obtained when testing the PF-2 arsenic and fluoride water filters (the water was not pre-filtered through the Black Berkey elements). The reduction over time is due to additional residual process dust being washed free from the PF-2 arsenic and fluoride water filters as the system is used. To give a scale for comparison purposes we include test results from a national brand toothpaste and water boiled in an aluminum pan.
  • National brand toothpaste 52.878 ppm aluminum
  • Water boiled in an aluminum pan for five minutes: 2.791 ppm aluminum
  • PF2 after conditioning (5 cycles): .178 ppm aluminum
  • PF2 after 10 Cycles: .037 ppm aluminum
  • PF2 after 20 Cycles: .029 ppm aluminum

While the above results indicate that the residual process dust adds a minute amount of aluminum to the water, the Black Berkey purification elements reduce aluminum from the water. We tested water that naturally contained .320ppm aluminum and filtered it through the combination of the Black Berkey and the post conditioned PF-2 arsenic and fluoride water filters (5 cycles). The results showed a net reduction in aluminum contamination (Raw influent: .320ppm - Effluent after passing through the Black Berkey and PF-2 arsenic and fluoride water filters: .232ppm). In other words, the Black Berkey elements removed more aluminum from the water than was added by the PF-2 arsenic and fluoride water filters. What is Aluminum Oxide?

For more information on the topic of fluoride, read below:



Activated Alumina is a granulated form of aluminum oxide. It is very porous and has a tremendous surface area for the removal of contaminants. In the removal process, the water containing arsenic and/or fluoride passes over the granules in the filter with the activated alumina adsorbing the arsenic and fluoride. The longer the water contact, the more the contaminants are removed.


Berkey Warranty

The manufacturer warrants this product to be free from defects in materials and workmanship for a period of 6 months from date of purchase. The manufacturer will replace or repair any product that it deems is not properly functioning during the stated warranty period.

BigBerkeyWaterFilters is always at your service to assist you with any warranty claims, send you replacement hardware free of charge if needed, or provide system maintenance support during the life of ownership.

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