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We are comparing two systems that are comparable in price and size.  The Big Berkey by NMCL and the Pro Big by ProPur.  We will compare the systems themselves, the specifications, the costs, and the filtration (or purification) elements.   System Specifications   Big Berkey Pro Big Height 19.25" 21.5" Diameter 8.5" 9.25" Dry Weight 6 lbs 5 lbs Storage 2.25 Gallons 2.75 Gallons Maximum Elements 4 4 Material AISI 304 Stainless Steel Stainless Steel       Output Big Berkey Pro Big Max Daily Output (using 2 elements) 84 Gallons 9 Gallons Max Daily Output (using 4 elements) 168...

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We are often asked how to properly run a system test on a Berkey unit.  The instructions that come with the unit highlight how to run a System Test with red dye. As the instructions state "[y]our Black Berkey purification elements are powerful enough to remove red food coloring from water; this feature allows you to make sure your system is operating properly........If the red food coloring is removed entirely, your purification system is working properly." TEST: run red dye through the filters RESULT: if the red dye is removed then the filters are operating properly Here is the proper...

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