Berkey Water Filter system is so powerful it is classified as a purifier. This classification shows that Berkey Water Filters far exceed the abilities of the standard water filter. The portable Berkey can be used to filter non-potable or unhealthy water in situations where electricity and pressure are not available. For normal everyday water from your faucet or for challenging environments like wells, rivers, and lakes, Berkey is the most flexible and adaptable filtering system available. Berkey water costs just 1.7 cents per gallon to produce. The cleanable Black Berkey replacement filters provide an economical, reliable and powerful long-term solution to poor water quality issues that cannot be equaled.