Free 2-Day Shipping on Orders Over $50* – Limited Time Only

When you come around a bend in the trail and find someone crouched in the mud, grunting and pumping furiously, your initial thought is usually a little disturbing. The Platypus GravityWorks Water Filter System cleans four liters of water in 2.5 minutes with no pumping and very little grunting required. Just fill the dirty water reservoir and hang it above the clean water reservoir. Gravity will take care of the rest.

  • Filter removes particles, protozoa, and bacteria down to 0.2 microns in size
  • Dirty reservoir’s quick-disconnect valve automatically shuts off the water flow when the hose is disconnected
  • Shutoff clamp on the clean water hose allows you to control water flow for filling bottles and shut filter off when not in use
  • Reservoirs feature SlimeGuard antimicrobial treatment to eliminate blecky tastes
  • Compatible with Platypus Bottles, Water Tanks, and Big Zip SL reservoirs, not included
  • Clean by holding the clean reservoir above the dirty reservoir to backflush the filter
  • Reviews
  • Q & A

What do you think about this product?

Have questions about this product?

Simple systems work the best

  • Familiarity:I've used it once or twice and have initial impressions

To me the most efficient and reliable filtering solution on the market. The gravity makes it extremely reliable, every time you use it basically.

The large reservoir allows to treat a larger amount of water (something to consider if you are backpacking in an area where water supplies are limited).

The plastic reservoirs have 2 advantages which people don't think of while shopping in the stores:

- It makes it easily accessibly to small streams (where a pump would have a harder time).

- It is extremely packable and will take less space in your pack.

It purifies all kind of bacterias and will do the job in most US water streams. It wont treat virus but this is not so much of a concern (tablets are great at treating viruses). If you really concern about having the most perfect water, I would add a tablet after filtering it with the Platypus.

Stop pumping!

  • Familiarity:I've used it several times

I have used pump filters for years. And I picked this up and I will never go back to pump filters. Gravity fed filtration is the the best innovation in filters I believe! Go buy one ifyou do a lot of filtering!

Buy it!

    It's been reviewed and there isn't much to add other than another positive recommendation. I researched and compared many filters; but, after seeing one in action, this is the filter system I chose. Comparing to other methods and designs I have seen when in the backcountry, I am happy I chose this.



    Super easy, light and fast. fill the clean and the dirty and take a ton of water back to camp. I bought a few extra pieces to connect directly to my Big Zip SL and I can fill my bladder without removing from my pack.



    Buy this filter!

    Buy it!

    Works well, handling sucks

    • Familiarity:I've used it several times

    In practice, this filter is awesome. It has a lot of nice features that really make it stand out: a good filter, a CLEAN bag that allows you to store water, and Platypus quality. The clean bag is so nice, especially if you have to hike to get water. On a recent trip in Zion, we had a 20 minute hike from our campsite down into a canyon for water, and it was nice to be able to store 8 liters in the system in addition to the bottles we filled up (4 in the DIRTY, 4 in the CLEAN). Then, as you need it, you can filter from the dirty or just use the clean. Nice feature. The filter works well, it floats, which is nice, and I haven't had it clog on me yet. Backflush-ability is a nice feature that others don't have, namely the similar Katadyn filter.

    The downfall of this filter though is how tough it is to dry out after use! I left it open, upside down, at my sink for weeks, and it still refuses to dry. You have to get a flow dryer or something to dry it out, and even then, you're left with a gross mildew smell. It's not easy to clean. Hovering between 3 and 4 stars for me, I'll round up, because I will most likely keep it and use it, but I hate cleaning the thing and trying to get it to dry.

    This is it - amazing

      Look no further, this is the water filter you want. No pumping, it works fast (while you're setting up camp) and it's lighter than other pump filters. Use this filter if you want to go fast and light and cover ground or if you're just car camping.

      Working great in the Adirondacks

      This filter is exceptionally easy to use. Cleans 4 liters of water while I can be off doing other things. The only issue I had was in keeping the "clean" components free from contaminants. The clean hose and clean opening on the filter seemed exposed to opportunity for contamination. Otherwise, it is a great product that is well designed and ridiculously convenient.

      Working great in the Adirondacks

      Fill it and forget it system

      • Familiarity:I've used it several times

      This is a well constructed system that filters 4 liters in minutes. The cleanside hose has a screw top connection that is compatable with the plusBottle, 2L Platy bottle and the Hoser bladders in addition to many more Platypus products.

      I have tweaked my setup by swapping out the filter opting to use the Sawyer PointONE filter instead. The weight is 1.8 oz for this filter compared to the Platypus which is 1.9 oz. The Sawyer filter is guaranteed for 1 million gallons compared to the Platypus 1500 liter filter life. This setup does require use of the Platypus or Sawyer quick disconnect fitting to connect the hoses to the filter. With some shortened hoses the total weight on my scale is 9.74 oz.

      The bladders will do their job as expected if you treat them right and maintain them like any other piece of gear you depend on in your gear arsenal. This is without a doubt money well spent and I would buy it again when it comes up missing or needs to be replaced.

      Fill it and forget it system

      Anyone know if this works with salt water?...

      Anyone know if this works with salt water? If not this, anything similar that does?

      I'm not sure I'm following exactly what you're looking to do here.



      If it's desalinization you're looking for, this absolutely won't work (sea salt micron size (0.035 microns) is well below 0.20 microns). The simplest and most cost-effective way to do that is distillation (boiling or evaporation...think still). The other way is reverse-osmosis, but I've never seen anything designed for it that would even be comparable to something like the Platy or any other personal filtration system. Those are generally big and expensive municipal or commercial operations.



      I hope I answered your question, but this is not the right tool for the job.

      Cool, not a problem. Something to think about. Knowing what you were looking for got me searching for what's available that might fit your needs. There's always the old plastic sheeting and cup method for making an emergency still, and that may indeed be the best and most compact way to go, but I found a video of a larger variation on that that might give you some ideas for rigging something up. All the real high tech stuff was huge, and at that point, you might as well just throw another 25 or 30 gallon jugs on board.



      http://www.youtube.com/watch?v=c9fepEyGRx8



      Bon voyage.

      How much use do you get before you need...

      How much use do you get before you need to replace the filter? (I didn't see this in other reviews or the info. Sorry if it's already been covered and I didn't see it).

      Hey Dru,

      Depends on the quality of water you're filtering to begin with and how often you back flush the cartridge. Running silty crap through it might give you only a few gallons, but under considerably better conditions, you should expect about 1500 liters or somewhere just south of that. I've used a MSR Autoflow gravity type filter system (also Cascade Designs) for a couple of years now and I'm absolutely thrilled and impressed by how easy, efficient and effective it's been. Bottom line: you won't be disappointed!

      I love the ease of this filter but am...

      I love the ease of this filter but am bothered by not being able to open the "clean" bladder for cleaning and drying. When I store it, it doesn't dry, and develops a moldy-musty odor, even though I have treated it with bleach water prior to storing. Anyone been able to solve this problem?

      I dry my clean reservoir in three steps: 1. Clean/rinse and then invert/drain/dry for 6-12 hours to get most water out; 2. Insert two re-formed coat hangers through the cap opening and lay reservoir horizontal; 3. I've rigged a small fan to introduce a modest amount of air through the cap opening. Mine is clean and bone dry in less than than 12 hours. Another option, I think, would be to clean/rinse/drain and then flatten and store in the freezer. It'll thaw quickly when you remove for your next adventure.



      My GravityWorks system came with a "zip" dirty reservoir and a "non-zip" clean reservoir. The current owners manual shows the same configuration (see pic below). Perhaps they changed product so that both reservoirs have zip access. I prefer the non-zip reservoir for my clean side - it's about an ounce lighter than the dirty zip reservoir and there's little chance that you'd accidentally dip the clean reservoir in water source (because it doesn't have the large zip opening).

      I dry my clean reservoir in three steps:  1. Clean/rinse and then invert/drain/dry for 6-12 hours to get most water out;  2. Insert two re-formed coat hangers through the cap opening and lay reservoir horizontal;  3. I've rigged a small fan to introduce a modest amount of air through the cap opening.  Mine is clean and bone dry in less than than 12 hours.  Another option, I think, would be to clean/rinse/drain and then flatten and store in the freezer.  It'll thaw quickly when you remove for your next adventure.

My GravityWorks system came with a "zip" dirty reservoir and a "non-zip" clean reservoir. The current owners manual shows the same configuration (see pic below).  Perhaps they changed product so that both reservoirs have zip access.  I prefer the non-zip reservoir for my clean side - it's about an ounce lighter than the dirty zip reservoir and there's little chance that you'd accidentally dip the clean reservoir in water source (because it doesn't have the large zip opening).

      Hope I can clarify this thread... The clean bladder does not have a zippered opening (I checked out one on the shelf at REI in Madison, WI yesterday). I visited the Platypus website again a few minutes ago and all current pics and descriptions show that clean bladder does not have a zippered opening. See my 8/20/12 response for more info. See pic below (shows zippered dirty bladder and non-zippered clean bladder).

      Hope I can clarify this thread... The clean bladder does not have a zippered opening (I checked out one on the shelf at REI in Madison, WI yesterday).  I visited the Platypus website again a few minutes ago and all current pics and descriptions show that clean bladder does not have a zippered opening.  See my 8/20/12 response for more info.  See pic below (shows zippered dirty bladder and non-zippered clean bladder).

      The original CleanStream did have a zippered opening on the clean bag. The GravityWorks does not. Inverting the bag on a Kitchen bag dryer works well to get the bag mostly dry, then just hang it out of the way for a few days and it should be good to go. Otherwise, for a quicker solution, lay it flat in the bottom of your freezer. That will keep the critters at bay and takes up almost zero space.

      I've seen a couple people post that you...

      I've seen a couple people post that you can carry up to 8 liters of water back to camp by filling both bladders with water. So I guess you have to somehow hold up the bladders while they filter and then refill the dirty side while you are at the water source?

      Is there a shutoff for the dirty hose so...

      Is there a shutoff for the dirty hose so that if there is still water in the dirty bag and one wants to fill a bottle from the clean bag, the flow to the filter can be temporarily stopped?
      Should a person purchase an extra filter or any other parts as a backup at the time of purchasing the system, or do the parts/filters last through lots of water filtering?

      Nate,

      There is one shutoff included with the system. I typically locate my shutoff in the outflow tube between the dirty reservoir and the filter cartridge. I do this, in part, because I use the clean hose and the clean reservoir (with a bite valve) as my hydration bladder during the day.

      I do hang the clean reservoir (say, at camp) to dispense filtered water. I simply loop the clean output hose up and over the same branch that supports the clean reservoir (the clean output hose wraps above the water level inside the clean reservoir). The only danger is that the clean output hose would get bumped or blown off the branch and would accidentally drain clean water to the ground (so far, not a problem for me). As you've mentioned, one could move the shutoff from the dirty reservoir output to the clean reservoir output (or simply buy another shutoff) to prevent accidental water loss.

      Hope this helps.

      - Scott

      Also - If you disconnect the hose from the 'dirty' water bladder, it won't leak/empty out. It's got a one way valve in the connection. I typically take just the dirty bladder to the water source (so i don't drop/contaminate/break the filter and hoses) then lug it up to camp to filter.