The micro-pores that make up Black Berkey® filters are so small that they prevent micro-particles such as viruses and bacteria from getting through. Even food dyes can't get through and the filtered water becomes crystal clear!

Viruses and bacteria are ultimately trapped in these extremely fine "winding paths" (of the order of a few microns), where the much smaller water molecules (H2O) are not.

This method effectively separates contaminants from purified water.

For more information on filtration capacity, you can consult the complete test results.