Finally, gravity filters arent our first choice for on-the-go water treatment, as setting up the system can take some time, and youll need somewhere to hang it (something to keep in mind if you're headed above treeline).. The MSR Thru-Link, for example, attaches directly to your water reservoir hose, and pump filters like the Katadyn Hiker and the MSR MiniWorks have adapters that fit the mouth of a standard Nalgene bottle. But weve never been sick after using a SteriPen, so those concerns havent yet been realized.See the SteriPen Ultra UV Water Purifier. 1.3 oz.Filter life: 10,000 litersWhat we like: The most advanced portable water purifier on the market.What we dont: At $390, the Guardian is the priciest option on this list. setup., Though eye-catching and certainly useful for a wide range of scenarios (think traveling in lesser-developed countries or hydrating in camp), the Grayl has limitations. Importantly, the included Platypus bag is also much more durable than those from Sawyer and even features a convenient handle for easy water retrieval. Pump filters are a great option for small groups (1-4 people), and especially when you need to pull water from shallow pools. For those wanting a dedicated water bottle filter, the LifeStraw Go has a lot of appeal. Like the Squeeze, the Mini attaches to its included bag or other compatible water bottle to squeeze filtered water into your mouth or drinking vessel. Keep in mind that the flow rates listed by the manufacturers are going to be realized in optimal circumstances (i.e. Because they are so small, the best way to combat viruses is through chemical or ultraviolet purification. The biggest downside of any chemical treatment is that despite the water being clean, its still unfiltered (in the Utah desert, for example, that may mean brown water with lots of critters). 
Instead of the various gravity filters, pumps, and chemical drops on this list, SteriPens technology uses UV rays to destroy bacteria, protozoa, and viruses. Type: Chemical purifierWeight: 3 oz.Treatment ratio:0.5liter per tabletWhat we like: Lightweight and cheap.What we dont: Tastes funky and takes 30 minutes to activate. Finally, keep in mind that when calculating the weight of your setup, that youll also want to factor in your water storage (bottle, reservoir, etc.). According to the CDC guide on water treatment, a pore size of 1 micron (or less) is needed to filter out protozoa, while youll need a pore size as small as 0.3 micron to filter out bacteria. All told, flow rate will be an important consideration for groups and time-conscious endeavors, but less of an issue for more casual hikers and backpackers. Our top picks for 2022below include everything from ultralight bottle filters and chemical drops to pumps and large-quantity gravity filters. Using simple mechanics (and some elbow grease), a pump siphons water from the source, through a hose and filter, and out another hose into a clean receptacle. Type: Pump filterWeight: 11 oz.Filter life: 750 litersWhat we like: A versatile and reliable filterthat can make clean water from puddles.What we dont: Relatively short filter life and pricey to replace. The Sawyer Squeeze epitomizes ultralight water treatment and has been a mainstay on the thru-hiking scene for years. With its included HydraPak bottle, the BeFree allows you to drink as you would from any standard water bottle, with the water passing directly through the filter on its way to your mouth. In fact, the Guardian is such a reliable and convenient system that its also used in the military and as an emergency water purifier after natural disasters. For $10 less, the AutoFlow can store up to 10 liters of water at a time, which will help you keep your trips to the source to a minimum. Last but not least, we should mention that just about every water filter and purifier can malfunction, which may leave you without clean water in the backcountry. Another downside is the rather pricey replacement filter: after approximately 750 liters, youll need to spend $55 for a new one (the MSR MiniWorks recommends a replacement filter after 2,000 liters and that costs $45). The Platypus Gravity Works is a user-friendly gravity filter with 4 liters of volume, but basecampers and larger groups might want to take a look at the MSR AutoFlow XL here. It has a number of things going for it, including a streamlined 3-ounce build, lifetime warranty (Sawyer doesnt even make replacement cartridges), and very reasonable price tag. The primary consideration here is cost: you have the initial purchase price of the item, but after a certain number of liters of water have been filtered, youll need to buy a replacement cartridge. Type:Bottle/inline filterWeight: 3 oz.Filter life: LifetimeWhat we like: Super lightweight, fast flow rate, long-lasting.What we dont: Youll have to buy extra gear to optimize your setup. Type: Bottle filter (inline adaptors available)Weight: 2 oz.Filter life: 100,000 gallonsWhat we like: Feathery light.What we dont: Well stick with the better-performing and longer-lasting Sawyer Squeeze. The biggest downside to the Thru-Link is that youll have to purchase additional gear to go along with itunlike the GravityWorks or BeFree above, it doesnt come with a compatible vessel. Second, by definition, a filter routes water through an actual sieve, which physically removes debris such as dirt, algae, leaves, and tiny critters. 
The LifeStraw weighs only 2 ounces and costs $20, and Aquamira drops are just $15 for enough solution to treat 30 gallons of water (and a mere 3 extra ounces in your backpack). We love these filters for their versatilityin addition to drinking from the bottle or pouch, you can also squeeze water into a separate receptacle for storage. 
The primary downside to MSRs AutoFlow system is the lack of a clean bag. And at $120, the GravityWorks is on the more expensive end of the water filtration spectrum. 
All told, its a well-built pump from one of the most trusted brands in water filtration. But similar to the Sawyer Squeeze, the Peak Squeeze also threads onto bottles with standard-size mouths and can be used as a gravity filter. Used in the popular Brita kitchen filters, carbon removes chlorine, organic compounds, and other bad odor and taste-inducing materials. At just 3 ounces and $15, Aquamira is a liquid chlorine dioxide solution that effectively kills protozoa, bacteria, and viruses. The most important distinction comes in the level of protection each method provides. But uses and budgets vary, and the ideal Backpackers need a stove that is lightweight, dependable, and will get the job done quickly after a long day on the trail. In general, gravity filters have the fastest flow rates: the Platypus GravityWorks filters 1.75 liters per minute, which means it only takes a few minutes to fill a 4-liter bladder with clean water. In addition, chemical purifiers can add an undesirable taste to your water, and UV purifiers require batteries and electronics, which arent great to rely on in the backcountry. The words filter and purifier often are used interchangeably, but knowing the differences between the two is a key step in choosing the best water treatment for your needs. Remember, this doesnt mean your water isnt safe to drinkyouve filtered or purified itbut you can always add an electrolyte-enhanced drink mix like Nuun Sport hydrationtablets to make it more palatable (or in the case of Potable Aqua, use the accompanying neutralizing tablets). Neutralizer tablets are available and do a decent job of masking the chemical flavor, and many people add a drink mix to make a tastier concoction.If youre wondering about the differences between iodine (Potable Aqua) and chlorine dioxide (the Katadyn and Aquamira above), the former is not effective in killing Cryptosporidium, while the latter is categorized by the CDC as having low to moderate effectiveness. Although theyre most commonly used in gravity setups, inline filters also can be paired with a hydration reservoir (purchased separately) to provide on-the-go filtration for solo travelers. Without a doubt, this system is inexpensive, lightweight, and wont malfunction like some of the more complicated filters and purifiers on this list., Our biggest issue with Aquamira drops is the mixing process. But should you find yourself with no other option, weve found a bandana (or other piece of clothing) to be the most effective pre-filtering method for straining out leaves, sand, and other bits before purification. But despite our gripes, no other filter comes close to matching the Squeezes versatility and longevity, which are undeniable draws for those who want to get a lot out of their gear. Finally, unlike the versatile Sawyer Squeeze, you only get a tube port on one end, meaning the Peak Squeeze cannot be used as an inline filter with a hydration reservoir. Instead of gravity doing the work, suction brings the water from the dirty bag, through the filter, and into the hydration hose to the mouth. And as with every form of water treatment that uses power, we recommend bringing a backup option into the field in case the Pure malfunctions. Water filters and purifiers range in weight and bulk, from super lightweight tablets that are just a fraction of an ounce, to the 1-pound 1-ounce MSR Guardian. By contrast, most purifiers use chemicals or ultraviolet light to treat water straight from the source (i.e. Given that their task is to remove contaminants from water, it should come as no surprise that many water filters need to be cleaned of this buildup. And if you prefer to go even lighter, Sawyer also offers Mini and Micro versions, although both have painfully slow flow rates that arent worth the 1-ounce (or less) weight savings.See the Sawyer Squeeze Water Filter. The water was rather murky, but thats no excuse for pump failure just a few days out of the box. A key product specification that we reference in this article is filter life, or how quickly your filter will need to be replaced. Type: Bottle filterWeight: 2.3 oz.Filter life: 1,000 litersWhat we like: Extremely light and great for on-the-go hydration.What we dont: Short lifespan and does not fit standard-sized water bottle openings. Finally, when using the SteriPen, its hard to feel totally confident that it workedrational or not. Their lightweight and easy-to-use design makes them a great option for weight-conscious trips and solo backpackers, day hikers, trail runners, cyclists, and more. At 12 ounces, its just a half-ounce heavier than the Gravity Works, and the inline filter passes water at an identical rate (1.75 L/min). For example, two of our favorite pump filters are the Katadyn Hiker and MSR MiniWorks. However, we have the MSR MiniWorks ranked here because of our own in-the-field experiences. But gravity filters arent for everyone: theyre bulkier and heavier than most alternatives, and youll need a fairly good water supply to fill up your reservoir (pumps are better for shallow sources). Potable Aqua tabs are a classic and a method thatweve used as a filter backup for years. The Peak Squeeze is relatively new to the scene, and though weve been impressed throughout testing, its too soon to tell if it will unseat popular models like the BeFree and QuickDraw. The lack of filtration certainly is a downside and means that unless you dont mind drinking silt or other particles, youre limited to moving water sources of a decent depth. Pump Filters/Purifiers The flow rate is impressive at 3 liters per minute (compared to the Squeezes 1.7 L/min. Pumps and gravity systems are the heaviest and bulkiest, and include multiple components like storage bags and hoses. Another option is to scoop the dirty water into a Ziploc bag, let the sediment settle, and transfer the clear water from the top into a bottle for treatment. The Pure Electrolytic comes with the same downsides of nearly all chemical treatment options. As with any manufacturer-provided spec, the listed filter life is optimistic and probably should be thought of as a maximum. In general, its a simple, lightweight set up that can purify 1-20 liters at a time, boasts a lifespan of 60,000 liters, and charges (slowly) using the attached solar panel. Used in this way, an inline filter will only add about 3 ounces to your kit (assuming youre already bringing a reservoir) and is one of the easiest and most efficient ways for individuals to stay hydrated. Most importantly, they kill bacteria, protozoa, and viruses, thereby purifying water for drinking. Cleaning pump filters is a slightly more intensive process, as you'll need to unscrewthe apparatus and either removethe filter or extenda brush down the interior. Further, our version became almost unworkable midway through a Utah backpacking trip. Additionally, the purifier cartridge has a lifespan of only 65 gallons, which pales in comparison even to the LifeStraw Go's 4,000 liters. And if you want to keep weight down, its also worth checking out the Hydroblu Versa Flow filter, which is still lightweight at 2.6 ounces but has a faster flow rate than the Mini.See the Sawyer Mini Filter. If you've ever gone camping, hiking, backpacking, climbing, mountain biking, trail running, or nearly anything else in the outdoors, chances are you've used a headlamp. UV purifiers like the SteriPen use ultraviolet rays to achieve the same effect.
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