Berkey BK4X4-BB Big Berkey Stainless Steel Water Filtration System with 4 Black Filter Elements<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Includes one Big Berkey water purification system， and 4 self-sterilizing Black Berkey water filters</li><li>Filter lifespan of 3000 gallons per filter， 6000 per set of two， or 12000 for the set of 4</li><li>Big Berkey has a 2.1 gallon capacity， produces up to 7 gallons of filtered water per hour， with 4 BF2s</li><li>Housing is high grade 304 stainless steel. Each Filter is cleanable and  self-sterilizing</li><li>Removes &gt;99.999% of viruses， pathogenic bacteria， chlorine &amp; volatile organic compounds</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31pK-IpLMfL.jpg" noproxy>