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  • Platypus - GravityWorks Filter Cartridge - One Color

Platypus GravityWorks Filter Cartridge


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    7 Reviews


    Keep your water free of microscopic hitchhikers that make you sick.

    The Platypus GravityWorks Filter Cartridge filters down to 0.2 microns and meets EPA Guide Standards for the removal of bacteria and protozoans. Pop one in the gravity line of your GravityWorks or CleanStream filter and enjoy fresh water. Measuring just about six inches in length and a few inches wide one of these spare filters takes up minimal room in your backpacking kit. It can't hurt to keep a spare around for particularly dirty water, or large groups that require a constant supply of high quality H20.
    • Item #CAS0697

    Tech Specs

    Purifying Element
    hollow fiber
    1.8 x 5.8 in

    Tech Specs

    California Proposition 65


    This product can expose you to chemicals including Styrene, which is known to the State of California to cause cancer. For more information go to

    • Reviews
    • Q & A

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    Best Group filter

    • Familiarity: I've put it through the wringer

    This gravity filter is perfect for groups and easy to use. I took this system on my Backpacking trip in Mountains of Peru. Some nights that the temperature was going to dip below freezing I did bring this filter in my sleeping bag to avoid it freezing at night. Worked great on the trip and I was never sick. "Back flushing" the system if the filtration speed slows down is a great trick.

    Works like a charm

    • Familiarity: I've used it several times
    • Height: 5'4"
    • Weight: 130lbs

    I've been trying to find a decent filter that isn't overpriced, and I am happy to say that I've found one! This filter is fast and efficient with no pumping needed, it's small and doesn't take up a lot of room in my pack.

    no pumping...whats not to love

    • Familiarity: I've put it through the wringer

    I got introduced to the gravity filter years ago on a remote Alaskan fishing trip. I've been a convert ever since. I bought this to replace or perhaps retire the original filter in my setup. If water is ridiculously filthy/silty, I sometimes let it settle (or use alum) and drain off the sediment first but usually I just hang the bag and walk away and do something else. If flow gets really bad, its nothing backflushing (which is just raising the 'clean bag' above the dirty) doesn't remedy quickly.

    Easiest Filter System I have ever used

      I bought this filter just to have an extra filter for my Platypus 4 Liter Gravity System. I used the system for two hiking seasons and have never had an issue. Back flushing has always cleared out slow filtering and I have never gotten sick. Even though this filter has fragility issues it isn't as easily broken as some make it seem. I would buy another if I needed too.

      takes a bit of thought

        I bought the filter and found that air in the feed line can block the water-flow until the air is pushed past. So I let the dirty water flow from the tube before I connect it to the filter.

        A few things to remember:

        1- it is fragile so do not drop it or the tubes may break.

        2- it is fragile so do not freeze it or the tubes may break.

        3- any air in the feed line will jam the filter until the air passes.

        4- the thing has a tiny filter! So be a fanatic about prefiltering your water to prevent clogging.

        5- when done, reverse the bags to back-flush the filter a bit.

        6- occasionally, backflush the filter with a liter of clean water to unclog the filter parts.

        7- the higher the dirty water, the better it works.

        8- a sharpie is your friend. Write "Dirty" and "clean" on the proper hoses and bags so you don't get them mixed up and highlite the flow arrow with your sharpie.

        I like to use the thing when I am at a base-camp. I set it up, go do something and refill the dirty water bag every 10 minutes or so.

        takes a bit of thought

        Love the Gravity Works Filters!

        • Familiarity: I've put it through the wringer

        This is by far the best way to filter water for large groups or even just for yourself. It is just so easy! forget all the pumping just scoop up the dirty lake or river water in to a platypus bag that you labeled dirty water and hook the filter up and another bag. Hang the dirty water bag higher than the clean water bag and forget about it, Go catch a fish or set up camp. Come back to it and you'll have clean water. This is the fastest gravity feed system i have seen and can easily go faster than pumping it. I do not go backpacking with out this filter! lasts a very long time and when the flow starts to slow just back flush the filter and then you have many more uses out of it. Defiantly pick this up if you do any sort of backpacking or camping where you need to filter lots of water or just a water bottle

        GravityWorks Cartridge Flows Like This

        If you're looking at this cartridge you probably already know about its features and benefits. If not, see my review of the excellent Platypus GravityWorks 4.0L Filter System. I think the GravityWorks systems flow like a stream!

        Video (test/first video upload) shows Arkansas' Buffalo River Trail after a spring rain.

        Foam drop pads

        Its interesting to note the gray ends are foam. This is to absorb shock should the filter get jostled or dropped. Apparently, the filter material itself is brittle.

        Foam drop pads

        Platypus GravityWorks Filter Cartridge uses Hollow Fiber Membrane (HFM) technology. HFM is a collection of small porous tubes that can be damaged by dropping or freezing. Hollow fiber filters can filter down to 0.2 microns, which effectively filters bacteria and protozoa.

        I've used the GravityWorks filtration system in the backcountry for nearly 5 years and have never had a problem with my cartridge (I'm still using my original one). I care for this filter like I care for all my gear - I use it but I don't abuse it.