Using the data from the Pacific Crest Trail survey, I've come up with a list of the best PCT water filters and treatment systems. It's a question that many hikers struggle with every year (unless you don't believe in treating because your thru-hiking power level is over 9,000) – how to turn delicious pathogen-filled water sources into delicious won't-get-you-sick water sources on the Pacific Crest Trail.
Although many PCT thru-hikers say things like “I only filter my water in the desert” or “I don't filter above 10,000 ft (3,048 m)” or “People don't get sick from not filtering, they get sick from not washing their hands” this does not mean you should give up treating your water (but you should definitely be washing your hands). Do you know how often I treat my water? Always. Do you know how many times I've been sick because of contaminated water? Zero. I'm not saying I had to filter my water all those times, but it's like my parents always told me: better safe than sorry (or “get off the damn internet, I need to use the phone!” Remember those days? No? You're lucky).
As appetizing and non-threatening as that mountain stream looks, you would be wise to take measures to combat any microscopic pathogens lurking within the deliciousness. Here's a look at the most popular (and favorite) options for water treatment on the PCT (and beyond).
Sawyer Squeeze
- Weight: 3 oz / 85 g
- Dimensions (in): 2 x 5
- Dimensions (cm): 5 x 12.7
- Filter medium: Hollow-fiber membrane
- Removes: Protozoa and bacteria
- Filter Type: Squeeze/gravity
- Housing: ABS plastic
- MSRP: $40
The Sawyer Squeeze is the most popular option for PCT thru-hikers. It's lightweight, compact, and rugged. Simply fill one of the provided bags (or water bottle), screw on the Squeeze and invert. You then squeeze the water through the filter and into your face hole (or another container). If you don't need to worry about viruses (like on the PCT), it's a great option. However, the flow rate slows over time (backflushing with the included plunger is highly recommended).
PROS: Small, lightweight, easy to use, can be attached directly to store-bought bottles (not wide mouth)
CONS: Flow rate decreases over time (have to backflush frequently), susceptible to freezing, not great groups
Sawyer MINI
- Weight: 2 oz / 57 g
- Dimensions (in): 1 x 5
- Dimensions (cm): 2.5 x 12.7
- Filter medium: Hollow-fiber membrane
- Removes: Protozoa and bacteria
- Filter Type: Squeeze/gravity
- Housing: ABS plastic
- MSRP: $20
The Sawyer MINI is the successor to the Sawyer Squeeze and operates in exactly the same way. It's 1 oz / 28 g lighter, slightly smaller, and works with the same bags and water bottles compatible with the original Sawyer. However, the flow rate of the MINI is slower than the original and over time the slowing only gets worse. This is probably not the filter you want to take with you on a thru-hike. Just spend the extra $20 and accept the extra 1 oz / 28 g and get the original.
PROS: Small, lightweight, easy to use, can be attached directly to store-bought bottles (not wide mouth)
CONS: Flow rate not great and decreases substantially over time, susceptible to freezing, not great groups
Aquamira Drops
- Weight: 3 oz / 85 g
- Dimensions: N/A
- Filter medium: Chlorine dioxide
- Removes: Protozoa, bacteria and viruses
- Filter Type: Drops
- Output: 114 liters (30 gal)
- MSRP: $15
Aquamira Drops use chlorine dioxide to kill bacteria, protozoa, and viruses. There are two small bottles in the kit which makes Aquamira an attractive lightweight solution to water treatment. Mix eight drops from each, wait five minutes, pour into your water, wait fifteen minutes, and you're ready to drink. But yes, twenty minutes is a long time. Many people use Aquamira as their primary treatment method, many others carry it as a backup.
PROS: Inexpensive, removes viruses, treats clear or muddy water, no aftertaste, you get to pretend you're a chemist
CONS: Won't remove sediment or make your water look cleaner, requires 20 minutes to treat a single liter, chemicals
Platypus GravityWorks
- Weight: 11.5 oz / 326 g
- Filter Dimensions: 3 x 7.4 in / 7.6 x 18.8 cm
- Reservoir: 19 x 8 in / 48 x 20 cm
- Filter medium: Hollow-fiber membrane
- Removes: Protozoa, bacteria
- Filter Type: Gravity
- MSRP: $100
The Platypus GravityWorks Water Filter System is made up of two bags with an inline filter between. You simply fill your “dirty” bag with water to be treated and then hang (or suspend) the two bags and let gravity force the water down through the filter and into the “clean” bag. Sure it may look bulky next to some other options, but everyone I've met with this filter seemed to be a supporter. It comes in both 2-liter and 4-liter versions. There's also an option that filters directly to a bottle.
PROS: Removes sediment, good for groups, filter 2 (or 4) liters at once, good flow rate (~1.75 L / min)
CONS: Heavier, not very compact, can free (which will damage filter), difficult to drink directly from filter
Katadyn BeFree
- Weight: 2.3 oz / 65 g
- Dimensions (in): 11.3 x 3.5 x 2.8
- Dimensions (cm): 29 x 9 x 7
- Filter medium: Hollow-fiber membrane
- Removes: Protozoa and bacteria
- Filter Type: Squeeze/gravity
- Housing: Thermoplastic polyurethane
- MSRP: $45
The Katadyn BeFree is a nozzle-type filter that screws onto a bottle (works with the included bottle or these HydraPak bottles – which I would recommend because they are more durable). The flow rate (when you purchase it) is incredible, but unfortunately, the flow rate diminished considerably over time (and it's not straightforward to clean). It removes bacteria, protozoa, and sediment from your water source. However, like the other hollow-fiber membrane filters here, it can freeze (and break) if left out in colder temperatures.
PROS: Removes sediment, lightweight, fantastic flow rate (in the beginning), easy to use
CONS: Compatible with limited number of bottles, clogs over time, included bottle isn't very durable, can freeze
SteriPEN Ultra
- Weight: 4.94 oz / 140 g
- Dimensions (in): 7.3 x 1.6 x 1.3
- Dimensions (cm): 18.5 x 4 x 3.3
- Filter medium: Ultraviolet light
- Removes: Protozoa, bacteria, viruses
- Filter Type: Ultraviolet
- L Per Charge: 50
- MSRP: $110
The SteriPEN Ultra will make you feel like a wizard when treating your water. It uses ultraviolet light to treat (clear) water for protozoa, bacteria, and viruses. There are a number of SteriPENs available, but the Ultra has a few advantages. It can filter a liter of water at a time, it can be used with practically any water bottle, and it is lighter than the SteriPEN Classic (which requires 4 AA batteries. The Ultra is USB rechargeable and filters up to 50 liters per charge. You can check out all the SteriPENs here.
PROS: Treats for viruses, rechargeable, compatible with most containers, 90 seconds/liter, LCD screen
CONS: Reliance on technology/battery, only effective treating clear water, does not remove particulate
Other options available to Pacific Crest Trail thru-hikers include liquid chlorine bleach (the ultralight treatment – if you don't count those who don't filter), purification tablets, or even an old fashioned pump filter (although these are less common on the PCT).
Comment below and let me know your thoughts, questions, or even own recommendation if you think there's something better out there that's not listed here.
Disclosure: This page contains affiliate links which means at no additional cost to you, I may receive small commissions for purchases made via these links. This helps keep the site up and running – thank you for your support!