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Gravity BeFree 3.0L Microfilter

4.7555555555555555 out of 5 stars
90 Reviews
Color:One Color



Gravity BeFree 3.0L Microfilter

Easy to use and quick to work, the Katadyn Gravity BeFree 3.0L Microfilter is your ticket to clean water whether you're thru-hiking the AT or just camping  out for the weekend. It features a hollow fiber filter that can process up to 2 liters of water per minute, eliminating microorganisms like protozoa and bacteria. The 43mm wide-mouth opening makes for easy filling from lake, river, or tap, and the integrated bail handle and carry loop let you hang it while it filters. To clean the filter in the field, simply shake or swish the EZ-Clean Membrane to remove debris.


  • Portable filtration system for backpacking and camping
  • Hollow fiber filter effectively removes microorganisms
  • Quick gravity action can filter 2 liters per minute
  • Collapsible reservoir is lightweight and packs small
  • Tested to filter up to 1000 liters of water
  • Item #EXT000M
Purifying Element
hollow fiber
protozoa and bacteria
EZ-Clean Membrane (hollow fiber)
Pore Size
0.1 micron
Cartridge Life
2 liters/min
Field Cleanable
filter, 3.0L reservoir, quick-release hose kit
15.2 x 9.1in
Claimed Weight
Manufacturer Warranty
1 year

Overall Rating

5 based on 90 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 2 reviews
3 Stars - 2 reviews
4 Stars - 12 reviews
5 Stars - 74 reviews

What do you think about this product?


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5 out of 5 stars

February 3, 2024

Good travel companion

I had a great experience using this filter when I traveled abroad for two weeks. It is very easy to use. I like how easy it is to clean the filter. I didn’t have any issues with leaking. You can drink straight from the mouth piece or fill up another water bottle. It has a nice oval hole which you can use to hang it. I plan to continue using my filter for future backpacking and travel trips.

Daniel B

Originally reviewed on

5 out of 5 stars

February 2, 2024

Filtering water at basecamp

I bought this for backpacking trips that involve setting up a basecamp for a few nights. I like that the included 3.0L bladder allows you to fill it up and then walk back to camp before filtering your water. I found the filter rate to be reasonably fast and would fill up a water bladder or bottles fairly quickly. It can also be used Creekside to fill up your bottle before moving on, or in areas with very little available water you can fill up your bottles and then carry it full of 3 liters to your camp site and filter the water later as needed.

Luke P

Originally reviewed on

4 out of 5 stars

January 30, 2024

So far...

Used it once on a 7 mile hike. Dipped into a swampy stream with lots of dissolved organic matter, yet the filtered water had a likable taste. Can't beat the packability!

Daren C

Originally reviewed on

5 out of 5 stars

January 19, 2024

Life changing

Great product in a convenient size. I bought this for bike packing so I could refill bottles on the fly when needed

steven jess K

Originally reviewed on

5 out of 5 stars

January 2, 2024

Super easy to use

Can't get more simple to use. Just fill it up and let gravity do the work. It's a lot more convenient than a pump or a grayl.

bret g

Originally reviewed on

5 out of 5 stars

January 1, 2024

So far so good

Used the 3L on two multi day backpacking trips and it worked great. First trip was below freezing and although I did a rookie maneuver and let the filter freeze the bag stayed pliable and still works as advertised. Second trip was during the summer months and performed flawless. In my opinion, a Much better option than the sawyer squeeze as they have failed on me several times.

Daniel P

Originally reviewed on

5 out of 5 stars

December 11, 2023

Filtered all out water for 11 days for 3 people. Super lightweight and compact. Filtered water super fast. The filter is really easy to clean. Love it. Gravity is the way to go. I'll never go back to a pump filter.

Preston W

Originally reviewed on

5 out of 5 stars

December 6, 2023

Awesome, lightweight, low labor water filter

Love this filter. I have used it several times while backpacking and hunting. It is great for passively filtering water at camp. It will filter the whole 3L in just a couple minutes, maybe less. When I am setting up camp, I pull this out, fill it up from a nearby water source, hang it, drop the dripper in a nalgene bottle or other water container (I use a saywer 1 gallon bladder thingy) and continue on with camp setup. Before I know it, its empty, and ready for more. I have filtered some very dirty stream water, and came out great, and didn't get sick. I once camped with another group that had a drip filter from another brand, and that thing took forever. This is way faster, and the convenience of being able to clean the filter without backwashing is amazing. The hose has a stopper, so you pause the flow if you wish to fill up multiple smaller containers. The last time I used this, my hiking buddy had the Hiker Pro, and he was able to filter faster that this could, but it was heavier, bulkier, and had to actively work to filter. Something like that would likely be a better choice if you aren't as concerned with weight, and want to stop on the trail and filter more often, allowing you to carry less water at once. Anyway, this is one of my favorite pieces of gear I have. Never thought I would say that about a water filter.

Adam S

Originally reviewed on

5 out of 5 stars

November 18, 2023

Great tasting!!

Product works great..will buy another one soon! Easy to bring withyou on camping trips!

Peter S

Originally reviewed on

5 out of 5 stars

October 31, 2023

Worked perfectly

Very straight forward gravity filter. Worked great. Light weight, easily stored in my pack. Used numerous times on recent backpacking trip. Filling the reservoir can be tricky, but it filtered the water just as it should. Very simple design, easy to clean. Great for all skill levels.

Matt W

Originally reviewed on