It’s a gravity-fed system, so there’s nothing to charge, pump or plug in. Fill the 1-Gallon Gravity Bag with freshwater, hang it from a branch, hook or rucksack, and gravity pulls the water through the filter and out of the hose. Hang it up and let it do its job.

The 0.1-micron hollow-fibre membrane is designed to remove bacteria, protozoa, parasites, microplastics and sediment [up to 99.99%, based on laboratory testing]. It is made for natural freshwater. It does not remove salt, chemicals, fuel or heavy metals.

Streams, rivers, lakes, ponds and collected rainwater all work. For the best flow and a longer filter life, use the clearest water you can find and avoid thick mud or silt. Don’t use seawater, or any water that may contain chemicals or industrial run-off.

None of these. It works entirely on gravity: no electricity, no batteries, no purification tablets and no waiting time. That’s what makes it dependable during a power cut.

The filter is rated for up to 1,500 gallons of water, depending on source water quality and maintenance. Regular backwashing helps maintain filtration performance.

When the flow slows down, backwash the filter with clean water using the syringe to clear trapped particles. Then let it dry completely before storing it. No replacement parts are needed between uses.

Store it clean and dry in your kit, car or rucksack. Never let the filter freeze while wet, because ice can damage the membrane. Dry it fully before storing it anywhere that might get cold, such as a garage, shed or car boot in winter.

1-Gallon Gravity Bag with hanging strap and carabiner, 1 x 0.1-micron filter, 1 x flexible hose with valve, 1 x clean-water pouch, 1 x drinking mouthpiece, 1 x backwash syringe, 1 x instruction sheet.

Orders are processed within 1–3 business days and delivered within 6–10 business days across the U.S., with tracking included.

You can request a return within 30 days of delivery, subject to our return policy.

For questions, contact us at contactornsan@gmail.com.