Yes, this filter can be used as a gravity filter, by hooking the "dirty" side to silicone tubing attached to your water source. If you already have a gravity system for camping/backpacking, you can use this filter with it, as long as the tubing fits the barbs. The tapered barbs on each end of our filter will fit anywhere from 1/4" silicone tubing, up to standard hydration bladder sized tubing.

Our Hollow Fiber Membrane filter with a 0.1 micron pore size removes the following:

• 99.9999% of Bacterias (including E. Coli)

• 99.99% of Parasites (including Guardia Lamblia)

• 99% of turbidity ("cloudiness" or "haziness")

Our filter does not filter salt water or remove viruses, harmful chemicals, or metals. Please use the proper equipment or sterilization tablets if you need to remove viruses from your water source. We recommend using a sterilization technique such as boiling or using sterilization tablets for long term use. 

The filter's lifespan is 5,000 Liters - 1,320 gallons (Equivalent to 9,992 standard water bottles).

Yes, we offer a 30-day money back guarantee, and a lifetime warranty on all of our products. Our 100% lifetime warranty has your back. 

The filter weighs slightly less than 2 ounces (55 grams). 

We recommend back flushing your filter with a mild bleach solution after use. To back flush, fill a water bottle with clean water (use a 1 Liter SmartWater bottle, collapsible water bag, or any standard water bottle) and screw your filter's "out" side onto the bottle. Squeeze the entire liter of water through your filter. Then, squeeze 1 Liter of clean water through your filter. This process should keep your filter clean, and ready to use for many years to come!