What are the dimensions of the Berkey PF-2™ and Berkey PF-4™ Elements?

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• Why is it necessary to purge the Berkey® Post Filter elements?

• Does the post filter media contain some amount of cyanuric acid, or is the media washed using cyanuric acid prior to packaging?

• There is a bubble that forms on top of my Berkey PF-2™, near the area where it attaches to the Black Berkey® Element in my system. Does this mean it is not working properly or needs to be tightened more?

• If NMCL’s recent test results show that the Black Berkey® Elements reduce Fluoride, then why do I need the Berkey PF-2™ Post Filter Elements?

• Are the Black Berkey® Elements or Berkey PF-2™ and PF-4™ recyclable?

• If Arsenic is removed using Black Berkey® Elements then what is the need for Berkey PF-2™ Elements?