ÖKO Purification Straw & Duo Replacement

The official DUO replacement filter straw that works standalone or in-bottle. Electro-Adsorption Filtration: ✓ Reduces and retains 200+ contaminants as water passes through, using membrane technology derived from NASA Spinoff research. Use it standalone in a glass, cup, or straight from the tap, or insert it into your OKOH2O DUO bottle for built-in filtration — independently tested by NSF-accredited laboratories. Built For Life On The Move: ✓ Fast flow rate of up to 1 liter per minute means no long wait for a drink. Rated for 756 liters, roughly a year of daily use, ideal for restaurants, hotels, travel, and camping. Removes and reinserts in seconds, no tools required. Use with water between 1°C and 50°C. Replace every 12 months.