One Gallon Gravity System
The Sawyer One Gallon Gravity System is a lightweight, robust solution for filtering large quantities of water.
- This System Includes the NEWDual Threaded MINI Filter
- Removes 99.99999% of Bacteria and 99.9999% of Protozoa and Cysts
- Has a Wide Mouth for Fast, Easy Filling
- Is Lightweight, Weighing 8.3 ounces with all the Included Components
With threads on both sides, you can now screw the push pull cap onto the MINI for easy on/off functionality while filtering with this easy to use One Gallon Gravity System. The Dual Threaded MINI Filter is also compatible with the cleaning coupling for backwashing (included in kit).
Filter Material: Hollow Fiber
Removes: Bacteria, Protozoa, E. Coli, Giardia, Vibrio Cholerea, Salmonella Typhi, Leptospirosis
Filter Life: up to 100,000 Gallons
Compatibility: Gravity Bladder, Inline Compatible, Plastic Bottles
Field Weight: 7 ounces
Total Weight : 8.25 ounces (including additional accessories)
Recommended Use: Hiking, backpacking, ultralight backpacking, camping, emergency preparedness
Product #: [SP160]
The flow rates of the filters and purifiers are determined by a combination of four variables:
- Head pressure (The distance from the top of the water to the filter)
- Altitude (The higher the altitude, the slower the flow rate)
- How clean the filter is
- The filter itself (there are slight variations between filters)
The PointONE Filter with a 1 foot hose (Model SP180) attached to a standard five gallon bucket at sea level is capable of filtering up to 295 gallons (1117 liters) of water per day. The PointZERO TWO Purifier with a 3 foot hose (Model SP190) attached to a standard 5 gallon bucket at sea level is capable of purifying up to 87 gallons (327 liters) of water per day. If you increase the head pressure by either lengthening the hose, attaching the filter to a larger container like a 55 gallon drum, or constantly keep the bucket full so the top of the water is as high as possible, this will increase the flow rate.
To estimate the flow rate of your filter based on the altitude where you will be filtering water and the inches (or centimeters) of head pressure:
– PointONE™ Filter full flow rate report (U.S. & metric) (PDF)
– Point Zero Two Purifier full flow rate report (PDF)
The frequency of cleaning depends on how dirty the water is. With relatively clear water, backwashing may only be necessary every 1,000 gallons whereas with extremely turbid or muddy water, backwashing may be required every 10 gallons. Nevertheless, backwashing is an extremely simple process and takes only a minute.