NOTE: Filters and Parts available now
British Berkefeld PF-4 Post Filter Reduction Elements


British Berkefeld PF-4 Post Filter Reduction Elements


7 in stock

British Berkefeld PF-4 Post Filter Reduction Elements

NOTE: IF using BLACK BERKEY filters you will need to purchase PF-2 post-reduction filters.

PF-4 reduction elements are designed for use in conjunction with Super Sterasyl™ ceramic filtration elements to remove or reduce fluoride, arsenic, and other heavy metals and contaminants.

Use with British Berkefeld, Berkey or similar Gravity Systemsin conjunction with Super Sterasyl™ ceramic elements. Will NOT fit onto the Black Berkey Filters.

Includes: Comes in a set of 2 or 4

Filter Capacity: Under normal conditions PF-4 elements should be replaced at six-month intervals. (Actual capacity depends on the presence of competing contaminants in source water. High levels of total organic carbons, volatile organic compounds or certain inorganic minerals may reduce capacity and efficiency.)

PF-4 elements FILTER and REDUCE as follows (with Super Sterasyl ceramic filtration elements):

  • Fluoride
  • Lead
  • Arsenic
  • MTBE (Methyl-tertiary-butyl-ether)
  • DBCP (Dibromo-chloro-propane)
  • THMs (trihalomethanes)
  • Herbicides & Pesticides
  • Heavy Metal ions



  • Do not boil element
  • Total filtration flow rate reduced slightly due to added water purification



Tests show that when 2000 gallon (7,600 litres) of influent water at a concentration of lead of 150-200 ppb pass through 200 grams of media at a flow rate of 1 gpm (3.8 lpm), the lead level was reduced to less than 1ppb (>99% reduction).


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. 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).

MTBE (Methyl-tertiary-butyl-ether)

The PF-4 is manufactured to exceed ANSI/NSF Standard 53 which requires that MTBE be reduced by at least two thirds from an influent rate (water going in) of 15ppb to an effluent rate (water going out) of less than 5ppb (> 95% reduction*).

The most common oxygenated fuel additive used in reformulated petrol, contamination of groundwater with MTBE is a rapidly growing problem in some areas. In drinking water, even trace amounts of MTBE can cause taste and odour problems, which may lead to nausea and dizziness. The potential long-term health effects of MTBE are not understood at this time.  However, initial studies indicate MTBE may cause kidney and liver problems. MTBE removal from water is a challenge because it is very soluble in water and must compete with other organics for binding sites on the filter medium. These other contaminants (BTEX – and TOC – total organic carbons) are adsorbed more readily, and MTBE often slips by standard carbon filters, ending up in filtered water. The PF-4 filter is specifically designed to remove MTBE from drinking water when used in conjunction with Super Sterasyl™ ceramic filtration elements. The media within the Super Sterasyl filters, in the upper chamber, capture the more strongly adsorbed BTEX and TOC’s.  This permits the downstream PF-4, secured as a post filter, to more efficiently remove MTBE.

Additional information

PF-4 Filters