Filter Or Purify? How To Treat Water While Traveling

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You’re backpacking through Banff National Park in Alberta, Canada. You’ll be getting your drinking water from Lake Louise, a glacial lake surrounded by hiking trails.

You’re on a safari in Ghana, Africa to see the elephants and antelopes. On the last night of your trip, you’re staying at a hotel and drinking tap water.

Clean drinking water is critical. When do you filter the water you’ll be drinking and when do you go one step further and purify it?

“Filtering and purifying water are two different, yet important things,” said Dave Keaveny, Medical Operations Specialist at Global Rescue. “It is important for the user to understand the difference and importance of both.”

The difference between filters and purifiers​

When you say you are going to “treat” your water, what does that really mean? The definition of water purification — the process of removing chemicals, contaminants, suspended solids, and gases from water — doesn’t hold true for all commercial products. There’s a difference between filters and purifiers:

  • Filters strain out protozoan cysts (such as Giardia lamblia which causes abdominal pain and nausea) and bacteria (such as Cholera which causes extreme diarrhea). Filters will also remove dirt, plastic, and other sediments.
  • Purifiers catch viruses, like hepatitis A and norovirus, which are too small for most filters.

Consideration 1: Filter​

Consider the backpacking trip in Canada. There’s less human traffic, meaning less human waste and fewer bacteria and viruses. If you need to treat water while traveling through the national park, you may only need to filter your water.

Water filters provide different levels of protection. There are products that can provide 0.1-micron filtration for bacteria, while others filter to 0.2 microns and remove bacteria, parasites and microplastics. Then there are filters that just make your water taste better, so read the product details carefully before selecting one.

Jeff Weinstein, Medical Operations Supervisor at Global Rescue, warned that “buying a filter and sticking it in the water to drink is a good way to get sick and possibly need a medical evacuation. It will not catch viral contaminants at an infected source.”

He recommended looking for a source “that has running water and no animals are living, dying or pooping upstream.”

Consideration 2: Purify​

In Ghana, more than half the people have limited sanitation services. In this case — and even though you’ll be drinking tap water — you’ll want to purify it. When traveling in less developed countries where sanitation is suspect, it’s more likely that pathogens will make their way to the faucet. Lifewater offers some startling statistics on water safety worldwide in the Global Water and Sanitation Crisis: 2019 Update.

“Water purification can occur through the use of chemicals (such as chlorine and iodine), by boiling water, or by utilizing UV rays,” Weinstein said.

Boiling will kill all the bacteria, viruses, and protozoa swimming around in the water. If done properly, the radiation from UV light will also destroy bacteria and other organisms. Chlorine dioxide or iodine tablets will also help, but some strains are extremely resistant to chemical disinfectants.

“Iodine tablets are for emergency purification of water; they shouldn’t be the primary plan for having clean water,” says Harding Bush, associate manager of operations at Global Rescue.

There are water purification methods that don’t rely on commercial gadgets. Weinstein recommended using a large, black garbage bag as a “transformation bag to get drinking water out of trees. You wrap the bag around the branches with duct tape, put leaves in the bag, and evaporation happens in the bag, instead of the atmosphere.”

He added that placing clear water bottles in direct sunlight for eight to 12 hours would help purify water as well.

REI breaks down which type of water purification products will help you avoid intestinal roulette and, worst-case scenario, a medical evacuation. Wilderness Today has a breakdown of all three water purification methods.

Consideration 3: Filter and Purify​

Keaveny and Weinstein, who both have Advanced Wilderness Life Support (AWLS) certification, recommended combining step one and step two to treat water while traveling — every single time you drink from a water source.

“It’s what we learned in wilderness school. There are two means of treating water for drinking purposes: filter it, then purify it. Period,” Weinstein said. There are products, like the MSR Guardian, that do both at the same time.”

Keep in mind you might be treating water several times a day, so look for a product that will work for you and your type of trip. Also make sure the water purifier is approved by the Environmental Protection Agency, which has a standard protocol for testing microbiological water purifiers.
 

steve white

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I had been under the impression that 1 micron filtering WOULD catch viruses...may have to reconsider just using my FirstNeed ceramic filter...
 

C.W. Richter

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I've been in the (severely contaminated) groundwater treatment business for over 30 yrs. Always opt to drink bottled water. If you can't, boil and filter it. Flowing spring or brook water from high elevation can just be filtered (filter or straw). My 80 yr old mom does it all the times on hikes and she's still just fine! It's the stagnant, low-elevation, turbid water that presents a potential danger. Use your head and save your trip! And, to be completely honest, even some bottled water is contaminated, but NOT to the degree you're going to get sick...(many have fancy labels, but they're just treated city water from industrial areas-Nestle (label: source-superdeeduper clean legendary spring OR dirty industrial city water system) lol I could name others where i have lab results with carcinogens.) Be mindful of the source of the water...Very few waters will acutely make you sick (on your trip.) Many will kill you of chronic effects over time...
 

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**eating/drinking a diet high in vitamins/antioxidants will go a long way toward preventing illness. realize the ad campaign/sales vs. the real world! ;) 'Been around the world. Number of travel sickness experiences: 0! I've heard many African PHs say the very same (esp. those near citrus plantations.)
 

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