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The official DUO replacement filter straw that works standalone or in-bottle.
Electro-Adsorption Filtration:
Built For Life On The Move:
Use with water between 1°C and 50°C. Replace every 12 months.
Dimensions & Weight
Materials
Filtration Technology
What It Filters
Filter Cartridge
- Free standard shipping on all orders
- Express shipping options available at an additional cost
- Orders processed and shipped within 2-3 business days
- 30-day return policy for a full refund or exchange if product is not used and in original packaging
- Return shipping covered for defective products only
While the bottle itself is dishwasher-safe (top rack only), we recommend hand washing to maximize its lifespan and protect the cap threads from potential wear.
IMPORTANT: Never put the filter in the dishwasher—it will be permanently damaged.
Hand Washing (Recommended):
Dishwasher Instructions:
If using a dishwasher, remove the cap and filter first, then place the bottle on the top rack only. Note that high heat settings may affect the bottle over time.
Our warranty covers defects in materials and workmanship of our products for a one year period from the date of purchase. Warranty does not cover damage due to use, misuse or abuse of products. It also does not cover damage from use other than specified in the product brochure (included with each product). Due to potential exposure to protozoa, bacteria and viruses, ÖKO reserves the right to refuse handling of used products.
Every creek, tap and spigot on the route is already a refill.
Fast-Flow
Filter Bottle
Detach The Straw
Virus-Grade
Survival Straw
Creek, spring, campground spigot, questionable hotel tap. 99.99% of viruses and 99.999% of bacteria removed, so the source stops being a decision you have to make.
200+
Contaminants
Removed
A moulded non-slip rubber base grips wet rock, a tailgate, or a desk, and keeps the bottle quiet every time you set it down.
Purifying without stripping out the essential minerals that make water taste right.
View Lab Reports →99.9%
Avg. Reduction
As Small As
1µm
Smallest Particle Removed
5-Log Reduction
99.999%
Avg. Reduction
99.99%
Avg. Reduction
Most filters just block contaminants, forcing water through a dense mechanical barrier. ÖKO is different: our electro-adsorptive media attracts and retains contaminants while letting clean water flow freely through. The result is faster flow and cleaner water.
Particles are physically blocked at the membrane surface.
Contaminants are drawn in magnetically and captured, while pure H2O passes through.
Fill with your favorite drink, hot or cold.
$800+
Annual Savings
Switching off single-use plastics pays the bottle back many times over.
200
Gallons Per Filter
One replaceable purifier straw covers a full year at about a litre a day.
NSF-Accredited Lab Tested
Independently verified for safety, clarity, and quality.