High demand – ships within 24–48h
Every sip goes through 4 stages:
1. Coarse screen – stops sand, mud and debris so the membrane stays clear, even in murky water.
2. Medical-grade PP cotton – catches fine sediment and micro-particles.
3. Flow-stabilising layer – spreads the pressure evenly so the draw stays smooth from the first sip to the last, easy for kids and older adults.
4. 0.01-micron hollow-fibre membrane – thousands of tiny fibres physically block bacteria, protozoa and microplastics.
No chemicals, no batteries, no waiting: clean water comes straight out of the mouthpiece.
Filtration: 4 stages, hollow-fibre membrane down to 0.01 micron
Removes: 99.99% of bacteria and protozoa, plus sediment and microplastics
Capacity: up to 1,088 gallons (≈4,100 L) per straw
Weight: about 2 oz (≈57 g)
Materials: BPA-free, FDA food-contact compliant
Quality: verified by an independent third-party lab, pressure-tested for membrane integrity, seal strength and leaks
Shelf life: no expiry when stored dry and away from freezing
Draw water through 3 to 5 times to prime the membrane and flush out any dust left from manufacturing. After that it's ready whenever you need it – even years later, as long as it was stored dry.
Like every hollow-fibre straw on the market, it does not remove viruses, chemicals, heavy metals or salt. Most brands just don't say it – we'd rather you know.
For layered coverage, pair it with purification tablets or UV treatment for viruses, and a carbon or reverse-osmosis filter for chemicals.
1 Tarnwild Water Filter Straw with its protective caps (per straw ordered).
Every order is packed with care and dispatched within 24–48 hours, with a tracking number sent by email.
You have 30 days to try it. If it's not for you, send it back for a full refund.
We never think about tap water – until a burst main, a boil-water notice or a long day out far from any shop.
One straw in a drawer or a backpack changes that. Small, simple and always ready: no power, no setup, nothing to maintain while it stays sealed.
Murky stream water in, clean drinking water out.
Before
After
From the first screen to the 0.01-micron membrane, each layer has one job – so what reaches your mouth is clean water.
No setup, no waiting.
Remove both caps and place the end of the straw in a stream, lake, rainwater or a bottle.
Draw a few times to get the water flowing through the membrane, then drink normally.
After use, blow a little air back through the mouthpiece to keep the membrane clear.
It's always better to have it and not need it. A straw costs less than a family meal out, takes no space and lasts for years in a drawer.
Keep one per person at home, one in the car and one in each backpack – simple enough for everyone to use, from teenagers to grandparents.
Keep a few bottles at home – and carry one straw everywhere.
A Must-Have for Every Emergency Kit
“I bought a few of these for our family emergency bags. They're lightweight, compact, and easy to carry anywhere. It's reassuring to have an extra way to access drinking water when things don't go as planned. Definitely something I'm glad we added to our supplies.”
Denver, CO 🇺🇸
Small Enough to Take Anywhere
“I originally bought one for hiking, but ended up ordering more for the whole family. It fits perfectly in my backpack without adding extra weight. Such a practical little thing to have around, especially when you're far from a reliable water supply.”
Portland, OR 🇺🇸
One Less Thing to Worry About
“With everything happening in the world, I wanted to be better prepared for unexpected situations. I ordered the family pack and put one in each emergency bag. Knowing we have another option for water filtration gives me real peace of mind.”
Austin, TX 🇺🇸
If your straw arrives damaged, doesn't work the way we describe, or simply isn't for you, we'll replace it or refund you within 30 days.
Everything you need to know before you order.
Boiling needs a fire or a stove, fuel and time to cool down. The straw works instantly, anywhere, with no power at all.
The 0.01-micron membrane removes 99.99% of bacteria and protozoa, as well as sediment, mud and microplastics.
It does not remove viruses, chemicals, heavy metals or salt – no straw filter does. Pair it with tablets or UV treatment for viruses, and a carbon or reverse-osmosis filter for chemicals.
Yes. It is verified by an independent third-party lab and pressure-tested for membrane integrity, seal strength and leak resistance. It's made from BPA-free, FDA food-contact compliant materials.
Yes. It's made for hikes, camping, travel and day trips just as much as for the kitchen drawer.
Up to 1,088 gallons (≈4,100 L) of filtered water – about a gallon a day for nearly 3 years. Once used, let it dry before storing it again.
Yes. The flow-stabilising layer keeps the draw smooth, so no hard sucking is needed. At about 2 oz, kids can easily carry their own.
We recommend one per person, plus one for the car. That's why most customers choose Buy 2 Get 2 Free or Buy 3 Get 3 Free.
Streams, lakes, rainwater or a stored bottle of tap water. Avoid salt water and water that may contain chemicals.
Keep it dry and away from freezing temperatures. Stored this way, it has no expiry date and nothing to charge – it works the same in year one as in year twenty.
You're covered by our 30-day money-back guarantee. Contact us and we'll replace it or refund you.
Better to have it and not need it, than need it and not have it.
Get yours now
