NSF Certified! The Ideal Filter for On-the-Go Forget bottled water. You can enjoy filtered drinking water just about anywhere with this compact gravity filter system! No plumbing or electricity required, just fill the upper chamber with untreated water, and the filter will reduce common contaminants, like chlorine, organics and heavy metals from your water. Features of the Baron Gravity Filter: Portable! - Its light weight and compact size makes it easy to take camping, hiking, or to the office and comfortably serves one person. Great for emergencies, 0.26 gal capacity (1 L).