PF-2 and PF-4 FAQ'S
Do your filter elements reduce fluoride in the water?
No, in order to reduce fluoride in your water you will need to use post filters
that work in conjunction with the filters in your system. We have two types,
PF-2's, which are used in conjunction with the Black Berkey® purification
elements, and the PF-4 filters that are used in conjunction with our ceramic
I noticed that the PF-4 elements also remove MTBE and heavy metals.
Should I use these with my Black Berkey® purification elements?
No, the PF2's are used in conjunction with the Black Berkey® purification
elements and the PF-4 elements are used in conjunction with the ceramic
filters. The Black Berkey® elements remove MTBE and reduce heavy metals
whereas the ceramic filters do not therefore; we incorporated MTBE and heavy
metals reduction capabilities into the PF-4 elements.
What is the life of the PF-4 filters?
Each set of four PF-4 filters is will last for 1,000 gallons or six months
whichever comes first. The reason for the six-month limitation is that the
carbon within the PF-4 filters extracts contaminates that can be nutrients on
which bacteria can grow. If the filters are used longer than six months “grow-
through” can occur.
What is the life of the PF-2 filters?
Each set of two PF-2 filters is will last for 1,000 gallons. Since these elements
contain pure fluoride and arsenic reduction media and no carbon, there is no
six-month limitation rule as is the case with the PF-4 elements.
How do I know when 1,000 gallons has been filtered and when its time to
replace the elements?
The best way to gauge when to replace the filters is to do the following:
1) Keep a track of how many times per week you need to refill your system.
2) Then multiply that figure times the capacity in gallons of your particular
system (for example the Berkey light™ system is 2.75 gallons) to determine
Total Gallons Used Per Week.
3) Finally divide the Total Gallons Used Per Week into the 1000 gallons and
that will tell you how many weeks before the filters should be replaced.
4) Next calculate the future date for replacement (52 weeks per year) and
write that date on a sticker and attach it to the bottom of your system for
By the way, if you have been using your fluoride reduction filters for some time
now, you can still use the above formula to determine when to replace the
elements. Just count forward from the date you purchased your elements.
I installed my PF-2 elements but my water is a bit cloudy and why does it
have a funny taste?
The odd taste is from process dust that may not have been washed free from
the filter elements during the conditioning process. Please remove the PF-2
elements and re-condition them for 60 seconds on both ends. This should
expel any residual process dust and fix the problem.
Do the PF-2 elements replace the Black Berkey® purification elements?
No the Black Berkey® elements fit into the base of the upper chamber with
the stems of the filters protruding through the holes in the base of the upper
chamber. The protruding stems are threaded and the PF-2 filters screw onto
these threaded stems so that the PF-2's hang down into the lower chamber.
The water flows from the upper chamber, through the Black Berkey® elements,
into the PF-2 filters and then into the lower chamber. The “PF” in PF-2 stands
for Post Filter. So in answer to your question, no they do not replace the black
filters but rather work in conjunction with them.
If I begin using use the PF-2 elements, will I need more counter space for
No, the PF-2's attach to the stems of the Black Berkey® elements and hang
down into the interior of the lower chamber of the system requiring no
additional counter space.
I understand that the media used within the fluoride reduction elements is
activated alumina, it that the same thing as aluminum?
The media used to extract the fluoride and arsenic is activated alumina. Since
fluoride is a by-product of aluminum production, fluoride has a natural affinity
to recombine with activated alumina making it an ideal extraction media. We
are not chemists but will communicate our understanding on the subject. Both
nutritionist and lab technicians have informed us that aluminum and alumina
are two separate animals. Aluminum can cross the blood brain barrier and
cause problems with the brain whereas alumina is inert. It is our
understanding that alumina is oxidized aluminum. Aluminum is regulated
whereas alumina is not for example, alumina is the material used for making
the paste in toothpaste. At any rate, when testing for aluminum in water,
most tests cannot distinguish between aluminum ions and oxidized alumina.
Since we are not chemists, we tested the effluent from the filters and included
that information in our brochure. While we were not required to do so, we felt
that it was important to disclose to our customers what our results were so
that they would have the necessary information to do further research on the
issue should they desire to do so. We thin it was significant in the test we
conducted using the combination of Black Berkey® elements and PF-2
elements there was a net reduction in the tested aluminum content of the
source water vs. the purified water. Again that test did not distinguish
between aluminum and alumina. The bottom line is that the media utilized is
oxidized alumina and not aluminum.
What are the dimensions of the PF-2 and PF-4 elements?
The individual elements are 6” in length and 2.5” in diameter.
I have high PH in my water, will that reduce the efficiency of the PF-2
That is correct, high or low PH impedes the ability of the media to remove