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  • System includes a 2-liter dirty collection reservoir, GravityWorks filter cartridge, universal bottle adapter and hoses
  • Fill the dirty collection reservoir, hang it above your water bottle and let gravity carry the water through the filter and hoses—filtering water has never been so easy!
  • Bottle adapter fits Platypus and most Nalgene, MSR, Sigg and Klean Kanteen bottles (sold separately); also attaches to most hydration reservoir shutoff valves and tubes
  • Hollow fiber filter technology offers a high flow rate of 1.5 liters per min.
  • Filter physically removes particles, protozoa, and bacteria down to 0.2 microns in size, including giardia, salmonella, cryptosporidia and others
  • Unfiltered reservoir features a quick-disconnect valve that automatically shuts off the flow of water when hose is disconnected
  • Shutoff hose clamp on the clean water hose allows on-demand water control for filling bottles; clamp also shuts off the system when not in use
  • Clean the system by simply holding the filtered-water container above the unfiltered-water reservoir to backflush the filter
  • Taste-free reservoir and silicone hoses ensure great-tasting water
  • Platypus GravityWorks Filter System Bottle kit weighs only 9.5 oz.

Made in USA.

View all Platypus Gravity Water Filters

REI membership


Best Use Backpacking
Filter Type Gravity
Filter Medium Hollow fiber
Removes/Destroys Protozoa and Bacteria
Output 1.5 liters per minute
Housing Material ABS plastic
BPA Free Yes, Yes
Field Cleanable Yes
Dimensions (Filter) 3 x 7.4 / (reservoir) 13.8 x 7.5 inches
Weight 9.5 ounces
Rated 4 out of 5 by from Little effort I purchased this filter system after an 8-day trip through the Smoky Mountains. One of the guys brought this filter. It made filling our water bottles each day a breeze. Just fill up the dirty bag and hang. It's that easy. No pumping necessary. Backflushing is a breeze. All you have to do is rais the dirty bag/bottle higher than the clean bag to reverse the flow of water through the filter. No reversing valves or disassembling necessary. I had to purchase my own. I took it on an overnighter and was just as pleased with it. A great buy.
Date published: 2013-06-21
Rated 5 out of 5 by from Saved our outing I bought the 2L gravity filter as a backup for our backpack on a section of the PCT this summer. And am I glad I did! By day 2 both the MSR pump filters had stopped working (goodness knows why?) leaving us with just the gravity filter for a party of 12. We did have a Steripen and tablets as backup for the backup but never needed them as the gravity filter just kept going. We must have gotten through 200+ liters over the next 5 days and so long as we back flushed it regularly it was like having water on tap (give it a good back flushing before you put it away too). It also air locked occasional, don't screw the cap on to bottles too tightly. Best thing I've bought in a while! I would might have bought the 4 liter version had I known we'd be using it so much.
Date published: 2014-08-23
Rated 5 out of 5 by from Excellent Product I was shopping for a replacement pump / filter and the sales person recommended this as a better alternative. It certainly is. I've always hated standing over a water source juggling bottles and pumping my arms off. This system eliminates all of that. Fill the bag, walk to the empty bottles, open the valve, fill the bottle and repeat until all bottles are full. The 2 liter dirty bag filtered directly into bottles is perfect for two. If I was going out with a group or setting up a base camp I'd take the 4 liter bag and maybe consider a 4 liter clean bag. What's nice is that all of the Platypus components are interchangeable, so you can tailor the system to whatever your needs are.
Date published: 2013-08-04
Rated 4 out of 5 by from Great when water is clear. Good when not so clear. -Great filter. Fast, simple, and can filter large volumes of water with comparatively little effort compared to pump style ceramic filters. -For family/group outings I don't think this system can be beat. You can gather a couple liters of water in the reservoir and fill an additional water bag to refill. For someone who is used to pumping while standing in a lake/creek or crouching near a water source, the gravity system is a welcome change. -You'll need to follow recommended backflushing schedule to keep flow rates up. I found that even when the water is fairly clear, you'll need to backflush. If the water has particles suspended you'll probably have to backflush every liter or so. Or, do as others have recommended and pre-strain. -Can't really complain too much about anything. However, I'm not dealing with murky or really cloudy water. I'd imagine that this filter would not be optimal under these conditions without some additional measures. But, which filter would be? -This filter won't replace my pump for solo hikes or fishing trips, but sure has its place for group/family outings.
Date published: 2014-07-08
Rated 4 out of 5 by from Preliminary report: Looks great This is just a preliminary review as winter won't go away and I haven't been able to use it in the back-country yet. But this is a great product. The filter is exactly the same as in the larger 4L version, so I won't focus on that. The clean reservoir is nicely designed. The handle has a clip that allows you to easily attach it around branches, etc. which is a nice touch. Also, you can arrange the handle so you are holding the strap twice, which shortens the handle when you're just carrying it, or you can hold it so the strap is longer when you're working on filling the reservoir. The adapter works surprisingly well. I mainly use platybottles as well as a water bladder, and the adapter works great for both. This also means I can leave the larger portion of the adapter at home, which is a nice bonus as less weight is always better. For the bladder, you simply have to take off the bitevalve, and you can filter directly into the bladder. A standard nalgene also works fine and when I tried with my smaller 16oz nalgene, that worked great as well. For all of those bottles, it fits tightly and snugly so you didn't have to hold the hose. The only reason I am not giving 5 stars is I haven't been able to try it with dirty water. Quick note: the bottle adapter does have 'air relief' holes so you can use it with solid bottles. This does mean that it leaks ever so slightly when you backflush the filter. It's very easy to avoid. Nothing's wrong, it's simply a feature they had to include so solid bottles could be used with the filter. For a bit more info on the adapter, you can click on the video. Sorry it's so quiet - it's my first video and I didn't quite know how to fix that.
Date published: 2013-04-23
Rated 5 out of 5 by from Best water filter I've used I just got back from my first back country use with the filter and honestly am really thrilled by it. First, disclaimers: I've only used it once, and cannot attest to it's durability. Also, the water I filtered was mostly clear. It's really easy to use, really fast, and well designed. I mainly used it to filter into a 1L platyplus bottle and my BigZip bladder. Both of these just require the inner portion of the bottle adapter, so I left the outer portion at home. Something I really wasn't expecting was how it filled my bladder, even while the bladder was in a fully packed pack. To fill the bladder, I simply pulled off the bite valve and hooked up the filter (I suggest you only do this with bladders that have an on-off switch at the bite valve, otherwise it would likely be tricky to hook up) It obviously took longer, but even with a pack bulging at the seams (had to take a much larger sleeping bag than normal) it worked. I will say that if you're planning on hiking with more than 2 people, you should probably get the larger version and possibly buy the bottle kit separate as 2L isn't a huge amount of water, but it filters so fast that filling up the dirty reservoir again isn't a big issue at all. I wanted to add this to my previous review but could not figure out how to edit that one.
Date published: 2013-05-27
Rated 4 out of 5 by from Good value purchase I truly believe that out of all the gravity filter options Platypus offers, this is likely the best value of all three. It's the same filter cartridge and same flow rate, but with a smaller "dirty" reservoir and a standard MSR/Nalgene style thread-on bottle mouth at the end. With a few quick mods, it's really convenient. This is what I've done: 1. I've removed those foam ends on the filter. I fail to see what good they are, but they're not heavy, just extra bulk. 2. I've cut the 'clean' line and spliced in a Camelbak style quick-connector to make it plug into my hydration system without having to remove it from my pack 3. I've replaced the 'dirty' bag with a discarded Camelbak reservoir. It still quick-connects on, but offers a filling capacity of 2.5 liters instead of 1.5, making it just a little more useful. 4. I swapped out that stuff sack for a different, less complex one. It's a great system, and the best of the three Platypus filters in terms of overall value. With a little tinkering, it's actually a truly useful system.
Date published: 2013-04-22
Rated 5 out of 5 by from Great filter! We used this filter in the Cruces Basin Wilderness of New Mexico in the summer of 2013. It worked very well. My only complaint is that the zip-top to the "dirty" reservoir was sometimes hard to close and the bottle adapter only worked with some of my water bottles. Otherwise, I was completely happy. It filtered like a champ...very fast and did an excellent job. There was a caterpiller blight hitting the Aspens in this wilderness and the darn things were dying and falling into the water and decomposing. So we were somewhat worried about the water. But the Platypus filter worked very well and we never were low on good clean water. The gravity feed system was excellent and saved us from having to manage and pump the filtering. A really excellent filter choice.
Date published: 2013-08-02
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Is the base system modular -- is this compatible with the two reservoir system? It looks like you could just change out the nozzle on the end and attach the base system to a bottle/ reservoir/ bladder/ etc but there's no mention in the description. 

Asked by: KayDalan
You can attach the GravityWorks Filter System Bottle Kit to any water bottle or hydration reservoir. You cannot attach the hose to another bag that comes with the GravityWorks 2 liter or 4 liter complete systems.
Answered by: REIservice
Date published: 2016-07-28

Will this easily fill my water bladder without having to screw anything close? 

Asked by: thisismon
You can filter water very easily directly from the GravityWorks Filter System to your hydration reservoir. All you have to do is remove the bite valve on your reservoir and plug the hose from your filter in. Platypus has a great video on their site showing this in action.
Answered by: REIservice
Date published: 2016-07-28

How long does the filter last?

Asked by: adumas3m
The GravityWorks Filter System Bottle Kit has 1,500 liter cartridge life.
Answered by: REIservice
Date published: 2016-07-28

Can this connect directly to a reservoir drinking valve, or would I have to disconnect the hose to connect the filter?

Asked by: Amberwave
The GravityWorks Filter System can connect directly to most reservoirs. You are even able to filter directly to a reservoir that is still in your pack.
Answered by: REIservice
Date published: 2016-07-28

Will this work with platty bottle 2l/70 oz.?

Asked by: Goat Monkey
Yes, the bottle adapter will work with a Platypus bottle.
Answered by: REIservice
Date published: 2015-09-20
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