Outdoor & Emergency Filtration: Straws, Bottles and Gravity UF
For hiking, travel, camps and emergency kits, 0.01 micron hollow-fiber ultrafiltration works with zero infrastructure: drink directly through a filter straw rated to 120 L/h with about 1,500 L (400 gallon) element life, or hang a gravity bag and let water weight alone push through the membrane - no pump, no power, no batteries.
The same PVDF hollow-fiber technology inside our whole-house modules shrinks to pocket size. Because the fibers are washable, one element survives a season of stream water instead of being thrown away.
What can a hollow fiber straw actually remove?
Bacteria, protozoa, sediment and turbidity at 0.01 micron absolute. It does not remove dissolved chemicals, salt or reliably viruses - for chemical hazards use a carbon or RO-rated system instead.
How long does one filter last?
The O-A1 straw is rated for 3,000 L (about 790 gallons) and the O-A6 for at least 1,000 L; both use a washable hollow fiber UF stage at 0.01 micron. Backflush and brush cleaning restore flow.
Does it work with no water pressure?
Yes - gravity feed is enough. We recommend hanging the source about 0.5 m above the filter for comfortable flow; portable UF elements are designed for that duty.
Typical configuration
O-A7 High-Flow Outdoor Filter Straw
High-flow variant of the survival straw with a 304 stainless steel stage added to ABS, silica gel, hollow fiber UF and PP cotton. At least 400 ml/min — a third more flow than O-A6 at 90 g.
400 ml/min, 90 g, washable
O-B1 Outdoor Water Filter Pouch
Gravity and squeeze filter pouch built around a hollow fiber UF cartridge: 300 L lifespan at 150 ml/min, and 35 g dry. Rolls flat when empty.
300 L capacity, 35 g
O-C3 High-Flow Survival Water Pump
Six-stage hand-pump filter rated 3000 L and 700–1000 ml/min at only 185 g. Stages: hollow fiber UF, coconut shell activated carbon, KDF, carbon fiber and PP cotton.
3,000 L at 700-1000 ml/min
Frequently asked questions
Can I clean it in the field?
Rinse and backflush with clean water; the hollow fiber tolerates brushing - that is the point of the washable UF stage.
How should I store it?
Store between 0 and 40 degrees C. Do not let a wet element freeze - drain it before cold storage.
Do these meet export certifications?
The straw line (O-A1, O-A6, O-A7) is on our CE technical-file verification and uses the NSF-certified PES membrane; retail packaging and branding available via OEM programs.
Work out the numbers
Wholesale, retail kits and OEM branding from 10 boxes.