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Which water treatment method is best for this trip?

Which Water Treatment is for You?
Fast, hassle-free, ultralight,–we explore five different water treatment scenarios and the right system to use.
by: Buck Tilton

You already know that pristine-looking backcountry lakes and streams can be contaminated with tiny, gut- twisting bacteria, protozoa, and viruses. But do you know which of the many water treatment methods on the market is the best for you? Here's how to decide.

You want One quick method for use domestically and abroad
Choose An ultraviolet light purifier like the SteriPEN ($80-$100, bombards water with UV rays, neutralizing bacteria, protozoa, and viruses (which are a particular problem in developing countries). It works in less than a minute and doesn't leave a chemical aftertaste. Caution: This handheld device works best in relatively clear water (strain with a bandana first if it's not) and requires batteries (pack spares).

You want The lightest possible treatment
Choose Chlorine dioxide tablets such as Aquamira ($8, weigh almost nothing (less than an ounce for 30) and take care of all three major types of bugs with a highly active form of oxygen. They're also easy to use—just pop one tablet into your bottle—but they take 30 minutes to kill Giardia and up to four hours for cryptosporidium. (Iodine tablets are also lightweight and cheap, but they won't kill crypto and leave an unpleasant taste.)

You want The best method for silty water
Choose Good old-fashioned boiling works everywhere, but it's perfect for ultracloudy rivers and sediment-choked puddles. Collect water in a pot, then fire up the stove: Not only will the high temperature kill bacteria, protozoa, and viruses, but the boiling will help the sediment settle out, leaving clear water on top. Simply bringing water to a rolling boil is sufficient. Cons: Boiling is fuel-intensive and requires waiting for water to cool.

You want An easy, speedy method
Choose Pump filters use microscopic pores (.2 microns or less) to snag bacteria and protozoa while allowing water to flow through the filter at one to three liters per minute. They shine where viruses aren't an issue, but can be pricy and require field maintenance. Where viruses are a problem (developing countries, near human habitation or agricultural runoff), choose a filter with iodine resin, upgrade to a purifier (First Need's XL model neutralizes the big three pathogens), or back up with a chemical treatment.

You want A hassle-free method for big groups
Choose Gravity filters are quick and trap everything a pump model does, but handle larger volumes of water. (The Platypus CleanStream filters four liters in less than three minutes; $90, The lightweight bags pack small and are a snap to use (just hang from a tree, let water drip, and drink).


I just purchased a 2 oz. Sawyer Mini Water Filtration System from REI for $19.95 including my 20% coupon!

"Weighing only 2 oz. and sized to fit in the palm of your hand, the Sawyer Mini water filter is one of the lightest, most compact filters available, and you can use it to drink straight from a stream! Hollow-fiber membrane offers a high flow rate; sip on the Mini like a straw and it filters the water while it's on the way to your mouth  Get down close to the stream or lake and use the filter to drink straight from the source, or fill your water bottle and insert the filter to start sipping

Filter will also fit the threads on the included Sawyer 16 fl. oz. reusable pouch (or other brand) that you can fill at a lake or stream and then use to squeeze water through the filter

0.1-micron filter physically removes 99.99999% of all bacteria, such as salmonella, cholera and E.coli; removes 99.9999% of all protozoa, such as Giardia and Cryptosporidium

Use the included syringe to back flush the filter to maintain a high-flow rate

Filter will also fit the threads on most bottles of water that you buy at a grocery store; can also be used as an inline filter (adapters and hoses not included)

Avoid freezing this filter; freezing may ruin the hollow-fiber membrane.

Includes Sawyer Mini water filter, one 16 fl. oz. reusable squeeze pouch, a filter tip cap and a cleaning syringe

Made in USA. Item 866577
--Robert Speik 04-08-14

07-24-14 Here is a current award-winning Review of this great filter system on Trailspace:






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