Water Filter vs Water Purifier

The term water filter is universally used to describe many water filtration devices including the Berkey systems. While the term can be an accurate description, the meaning when talking about water treatment standards is different.

Lets take a look at the two standards when classifying water treatment devices;

Water Filter

This classification must meet the following standard:





  Pathogenic Bacteria  Klebsiella terrigena

 greater than

99.99% reduction 

Known as (Log 4)

Water Purifiers

In order to be in this classification the following standard must be met:




 Pathogenic Bacteria

 Klebsiella terrigena

 greater than

99.9999% reduction

Known as (Log 6)

 Virus  Polio and Rota

 greater than

99.99% reduction

known as  (Log 4)


All Berkey systems contain the Black Berkey Filters and meet the Water purifier standard. In fact Berkey Purifiers far surpass this standard and actually remove 99.9999999% known as a  log 9 reduction, when dealing with pathogenic bacteria. This distinction is what makes Berkey the only certifiable gravity flow water purification system.

Please take a look at the following chart which includes a head to head comparison with our competition and see for yourself which classification they claim. Take note that some use harsh chemicals in order to reach the level of purification, chemicals like iodine or chlorinating tablets. We do not have to use chemicals, only our unique ionic adsorbtion process mated with simple microfiltration. In short these two methods create a pore structure so minute that contaminants are removed from the water because they simply cannot pass through the charged filtering media.


Water Purification Systems and Filters

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