USWF Gravity Water Filtration Systems are a practical and cost-effective water filtration solution. By utilizing the power of gravity to draw unfiltered water from the top chamber into the bottom chamber, this system does not require any electricity, and does not need to be connected to any permanent water supply. Because of its simplicity and convenience it is the perfect water filter for outdoor camping, RVing, off-grid homesteads, but also works on any kitchen counter. It provides clean great tasting water for up to 6,000 gallons per pair of carbon filters and 1,000 gallons per pair of fluoride filters, in a durable stainless steel housing that is built to last. The 2.25 capacity can meet the demand of a family of 4, and the included sight glass spigot provides a visual indicator for when the upper chamber needs to be refilled. Tested and Certified by IAPMO R&T to NSF/ANSI Standard 372.