Fluoride & Arsenic Post Reduction Filters

NOTE: IF using Ceramic filters you will need to purchase PF-4 post-reduction filters. The PF-2 will not even fit on the end.

The PF-2 fluoride & arsenic reduction filter (set of 2) work in conjunction with the Black Berkey purification elements as they fit onto the end of the Black Berkey elements while sitting in the lower chamber of a gravity filter unit as shown. They will fit into all of the Berkey systems EXCEPT the Go Berkey Kit.

Use with Berkey Systems: Travel, Big, Royal, Imperial, Crown and Berkey Light
Includes: Comes in a set of 2

Filter Capacity: 3,785 litres per set of two under normal usage.  Note that high levels of Fluoride, arsenic and heavy metals can reduce the capacity and efficiency of the elements.

These FILTER and REDUCE as follows (with Black Berkey Purification elements):

  • Fluoride
  • Arsenic V and pre-oxidized Arsenic III
  • (Targets entire family of arsenic oxide anions as well as the arsenic cations)
  • Other residual heavy metal ions


  • Do not boil element
  • Total filtration flow rate reduced by 15-20% due to added water purification



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 per cubic foot of media. 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).

The media used in the PF-2 filter elements contains high-grade activated aluminium oxide, which  is currently the most efficient media available for extracting fluoride from water. The results below have been obtained when testing the PF-2 elements (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 elements as the system is used. To give a scale for comparison purposes, test results include a US national brand toothpaste and water boiled in an aluminium pan.

• US National brand toothpaste 52.878 ppm aluminium
• Water boiled in an aluminium pan for five minutes: 2.791 ppm aluminium
• PF2 after conditioning (5 cycles): .178 ppm aluminium
• PF2 after 10 Cycles: .037 ppm aluminium
• PF2 after 20 Cycles: .029 ppm aluminium

While these results indicate that the residual process dust adds a minute amount of aluminium to the water, the Black Berkey® purification elements reduce aluminium from the water.  The water tested naturally contained .320ppm aluminium and was filtered through a combination of the Black Berkey® and the post conditioned PF-2 filtration elements (5 cycles). The results showed a net reduction in aluminium contamination (Raw influent: .320ppm – Effluent after passing through the Black Berkey® and PF-2 elements: .232ppm).

In other words the Black Berkey® elements removed more aluminium from the water than was added by the PF-2 elements.