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All Black Berkey Filter Elements are sold in pairs
Black Berkey Purification Elements are more powerful than any other gravity filter element currently available! Allowing you to PURIFY water from lakes, streams and ponds!
Black Berkey elements are tested with more than 10,000 times the concentration of pathogens per liter thaqn is required by the standard testing protocol. This concentration is so great the the post-filtered water was expected to contain 100,000 or more pathogens per liter (based on 99.99% reduction - the current requirement for pathogenic removal.)
Incredibly the Black Berkey Purification Elements removed 100%. Absolutely no pathogens were cultured from the effluent or were able to be detected! EVEN UNDER AN ELECTRON MICROSCOPE! Setting a new standard in water purification!
VIRUSES: Exceeds purification standards (>99.999%)
Pathogenic Bacteria, Cysts and Parasites: Exceeds purification standards (>99.9999%)
Trihalomethanes: Removed to Below Detectable Limits
Volatile Organic Compounds (VOC's): Removed to Below Detectable Limits
Heavy Metals: Reduced by up to 95%
Also Removes or Reduces:
Rust, Silt and Sediment, Foul Tastes and Odors