Safe Drinking Water
(What could be more important?)

Beautiful, stainless steel water filter


PF-4  reduction elements are designed for use in conjunction with British Berkefeld® and Berkey™ series of water filters to adsorb the following four unwanted elements most commonly found in drinking water.

* MTBE (Methyl-tertiary-butyl-ether)
* Fluoride
* Lead
* Arsenic
PF-4 filters are also designed to adsorb:

* DBCP (Dibromo-chloro-propane)
* THMs (trihalomethanes)
* Herbicides & Pesticides 
* Heavy Metal ions



PF-4 Reduction Elements set of 4


MTBE: 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*). LEAD: Tests have shown that when 2000 gallon of influent water at a concentration of lead of 150-200 ppb pass through 200 grams of media at a flow rate of 1gpm, the lead level was reduced to less than 1ppb (>99% reduction). FLOURIDE: 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).

Length: 6 in.                 Width: 2.5 in.              


Under normal conditions it is recommended that PF-4 elements be replaced at six-month intervals (Actual capacity is dependent on the presence of other competing contaminants in the source water. High levels of total organic carbons, volatile organic compounds or certain inorganic minerals may reduce the capacity and efficiency of these elements.)*. Note: do not boil this element.



*MTBE (Methyl-tertiary-butyl-ether) is the most common oxygenated fuel additive used in reformulated gasoline. Contamination of groundwater with MTBE is a rapidly growing problem. In drinking water, even trace amounts of MTBE can cause taste and odor 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 the filtered water. The PF-4 filter has been specifically designed to remove MTBE from drinking water when used in conjunction with a British Berkefeld® gravity filter system. 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.


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