I use a 6" x 6" square of this material as a water pre-filter for hiking when I have to get my drinking water from polluted sources. 0.5 micron is small enough to filter out sediment and a good percentage of soluble clay that makes the water cloudy. I use this sheet to pre-filter before running my drinking water through a Sawyer Squeeze. This saves the Sawyer from premature clogging and repeated backwashing. Excellent material that will last for many years. I have shared some with other backpackers and they loved it.
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