Once the water has passed through the ceramic sleeve, it passes through a second charcoal filter which removes unpleasant tastes and odors, before it drains out the pump’s base into a bottle or reservoir.Īll of the foreign mater extracted by the filter remains on the sleeve’s external surface (see the grey dots on the filter’s surface below) When the filter’s flow rate slows, you can remove the foreign matter by scrubbing the ceramic sleeve with the small synthetic sponge included with MiniWorks unit. The sleeve has 0.2-micron holes that trap any harmful organisms, grit, or organic matter on its surface and only let clean water through. The filter element is a hollow plastic tube, coated with a ceramic sleeve. The pump sucks water up the hose and forces it under pressure into a plastic housing containing the filter element. To filter water, you screw the pump unit onto a wide-mouth bottle or reservoir, stick the hose in the water and start pumping. It takes me 80 seconds to filter a liter of water with the MSR MiniWorks EX Water Filter Pump and Filter Element You might want to wrap it loosely with waterproof tape so it stays on the hose, but can still be repositioned along with it. The MiniWorks float can be removed from the hose, but also has a tendency to fall off when the unit is packed. This benefit is outside the scope of possibility for any other kind of backcountry water filter. The MiniWorks pre-filter is suspended from a foam float which you can reposition in order to get clean water below a murky surface film or avoid the sludge at the bottom of a pond or stream. Having a pre-filter is extremely useful if you need to get water from sources that are cloudy or have a lot of suspended solids in them like puddles, cattle troughs, beaver ponds, creeks, and snowmelt because it increases filter life and decreases filter maintenance. The foam float lets you position the intake valve below the surface of the water or above the bottom of a water source to help minimize silt or muck intakeĪ pre-filter is designed to block or remove as much muck (soil, sand, suspended solids, and guppies) from the water as possible before it reaches the ceramic filter, which is responsible for removing microorganisms. A hose also lets you sit in a more comfortable position while you filter water, which can be a godsend if you have to do it for a group. These also provide some unique advantages over other water filtration and purification methodsĪ hose lets you obtain water from hard-to-reach water sources such as shallow seeps, boulder-covered springs, water flowing underneath obstructions like snow and ice, or down steep stream and river banks. Most pump filters, including the MiniWorks EX come with a hose, pre-filter, and a float. MSR MiniWorks Components Hose and Pre-filter If that’s the case, the MSR MiniWorks EX water filter should be on your shortlist because most ultralight hollow-fiber membrane filters only work with small-mouth soda bottles or require their own proprietary-sized bottles to function, like the Katadyn BeFree. If you prefer to carry hard plastic Nalgene style bottles, Nalgene soft canteens, MSR Dromedary, or MSR DromLite water bladders, chances are you’ll value the MiniWorks’ convenience for using a wide-mouth hydration system more. Wide Mouth Bottle Compatibilityīut there’s another factor that’s equally important when choosing which water filter to use and that is wide-mouth bottle compatibility. But pump filters are generally the heaviest form of water filtration available for hikers and backpackers compared to squeeze bottle filters, in-line filters, gravity filter systems, filter-straws, and UV purification, and therefore less attractive in terms of gear weight. Pump filters still have their uses though and are arguably better for obtaining and filtering water from turbid and cloudy water sources like snowmelt, beaver ponds, and cattle troughs. The popularity of pump-style water filters has plunged in recent years due to the introduction of lighter-weight hollow-fiber membrane water filters like the Sawyer Squeeze.
Filter Lifetime: 2000 liters, replacement filters sold separately.Wide-mouth MSR Dromedary and Dromlite Bladders.99.9% of Protozoa (Giardia, Cryptosporidium, etc).99.9999% of Bacteria (E.coli, Salmonella, etc.).While the MiniWorks is heavier than simpler squeeze-style water filters, it's a better solution for filtering turbid, cloudy, or tannic water sources like snowmelt, spring thaw, and algae-infested ponds. He MSR MiniWorks EX is an elegantly engineered water filter system that's effective for removing bacteria and protozoa from backcountry water sources and is compatible with wide-mouth hydration bottles and bladders.
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