How It Works
Ready for the unexpected. Pure Flow Water Filter adapts easily to any situation.
Drink directly from a stream, connect it to your water bottle, or use it with the gravity bag. The high-performance filtration core works instantly using only natural pressure. No batteries. No pumping. No waiting.
Drink directly through the filter or squeeze the bag to push water through it.
Hollow-fiber membranes with 0.01-micron pores block bacteria and pathogens.
Harmful particles are trapped on the fiber surface and never reach your mouth.
Filtered water flows straight from the mouthpiece: clean, safe, and ready to drink.
A complete filtration system that fits in your backpack
What Pure Flow Water Filter Filters
THE MOST COMMON THREATS...
Pathogenic and Fecal Bacteria
All are larger than the membrane’s 0.01-micron pore size.
- E. coli
- Salmonella
- Shigella
- Campylobacter
- Vibrio cholerae (cholera)
- Fecal coliforms
Why it matters: They are responsible for most severe cases of waterborne illness worldwide.
Protozoa and Parasites
They are blocked due to their size and cellular structure.
- Giardia lamblia
- Cryptosporidium parvum
- Entamoeba histolytica
- Cysts and oocysts
Why it matters: These organisms can cause persistent gastrointestinal illness and dangerous dehydration.
Microplastics
Found in lakes, rivers, streams, and tap water.
- Particles and fibers
- Fragments and microbeads
- Polymers > 0.01 microns
Why it matters: Microplastics have been found in more than 80% of the natural water sources tested.
Organic Matter
It is trapped on the outer surface of the fiber membrane.
- Algae and biofilm
- Plant debris
- Decaying leaves
Why it matters: The buildup of organic matter affects both the taste and safety of water.
Inorganic Sediments
They are mechanically filtered before the water reaches the membrane.
- Sand and silt
- Clay particles
- Rust particles
Why it matters: They are found in virtually any untreated natural water source.
Turbidity and Visible Contaminants
Reduces turbidity and improves water clarity.
Why it matters: Clearer water does not necessarily mean it is safe to drink.
Biological Hazards (> 0.01 microns)
Traps a wide range of biological contaminants, including worm eggs, larvae, nematodes, and clusters of bacteria.
Why it matters: Water from untreated natural sources often contains biological hazards invisible to the naked eye.
Attach it to your backpack, belt, or emergency bag to keep it within reach whenever you need it.
The heart of the system: hollow-fiber membranes inside the filter help remove contaminants from water when you need it.
Illustrated step-by-step instructions so any family member can start using it with ease.
Reach streams, puddles, or collection containers without having to get close to a questionable water source.
A collapsible reservoir that stores flat and holds water for immediate needs. Screw it on, squeeze the bag, and let the filter do the rest.
Pure Flow Water Filter Straw
Pure Flow Water Filter Straw
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