It filters natural fresh water such as rivers, lakes, streams, snowmelt, and rainwater. It should not be used on chemically contaminated or industrial run-off water.

No, this filter is engineered for fresh water and cannot remove dissolved salts or heavy metals from seawater.

Backwash the straw with clean tap water after use and allow it to dry thoroughly before storing to prolong filter lifespan.

It reliably purifies up to 4,000 litres of clear natural water before the flow rate slows and requires replacement.

Yes, both ends feature screw threading compatible with standard 28mm threaded bottles, hydration bladders, and squeeze pouches.

Unopened and stored in a dry environment, the straw retains full filtration efficacy for up to five years from production.

No, sugary or coloured liquids will clog the ultrafiltration membrane and permanently impair filtration efficiency. Use only on fresh water.

The straw allows an effortless, steady flow rate, enabling comfortable drinking directly from water sources without excessive suction.