Quick review of my grayl water filter I did last year.  It's a quick and easy to use water purifier that takes out viruses, bacteria, protozoa, and chemicals/heavy metals.  It's rare to have a portable device that can remove all of those contaminants.  One filter can clean up to 65 gallons.  It is bulky and they sell a smaller one called the ultra press.  I use it for backpacking, trips to other countries with questionable water, and emergencies.  I love mine.



On sale at grayl.com and amazon for 20% off.  https://grayl.com/collections/geopress-filter-purifier/products/24oz-geopress-filter-purifier-water-bottle-nature-edition







Used my Grayl water purifier for the first time in American Samoa.  Just used it for tap water for now, which locals recommend not drinking.  Might try it on a stream later.  You wouldn't normally carry it in the 24hr pack due to it's size.  It would be good at Basecamp or places with really bad water.

Positives:
1.  Filters it all...viruses, lepto, bacteria, protozoa, chemicals, and heavy metals.
2.  Quick and easy to use
3.  Charcoal filter removes the bad tastes

Negatives:
1.  It's big and heavy
2.  Filters have a relatively short life