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Rated 1 out of 5 by from Leave this one at Home I read the reviews here about the Katadyn Gravity 6L failing even in what appears to be clean water and should have listened. This is not a piece of gear I would recommend. I was careful to obtain water that appeared clear, not fast flowing, but still areas where water appeared visibly free of sentiment. I checked the window of the bag before using to re-confirm it was clear. After three (3) full bags the flow was diminished to all but a trickle. There was no visible debris trapped on the outside of the plastic screen trap, so I decided to put this away and take home to re-examine. We switched to our MSR Guardian and had no issues. Watch the video, it speaks for itself.
Date published: 2017-08-15
Rated 5 out of 5 by from I love this filter Bought this after my MSR Sweetwater clogged after a disappointingly low amount of throughput. No amount of scrubbing would make it flow more than 1.5l. Returned it and Chose the Gravity Camp for it's standing cylindrical filter. This gives a LOT of surface area for filtration, and settling sediment will not foul it's intake. I've put about 50 liters through it, almost twice what I put through the first filter. I LOVE this filter. I love that it clips right into my camelbak bladders, I love not having to pump anything, and I love how fast it flows. my only complaint is that it's not free!
Date published: 2016-01-09
Rated 5 out of 5 by from Wow is this thing fast! My dad had purchased one of the original Katadyn gravity filters and we used it all the time in the Boundary Waters. Unbelievably convenient compared to hand pumps! I bought this one, because when we have smaller groups, we don't need the full 10L capacity. Overall, I'm very impressed with this model. The window is a nice addition (though it was easy to see how much water was in it before by looking at the shape of the bag), but the biggest upgrade is the speed. This filter goes through a full thing of water in no time. Much faster than my dad's filter ever was. My only complaint is that after you scoop some water, you want to avoid setting the bag down while rolling the top. I did and it tore a section of my hose where it connects to the bag. Not a huge problem though as I pulled it off, cut out the torn section, then reattached. If you camp, buy this filter.
Date published: 2014-09-29
Rated 5 out of 5 by from Works very well Have used this twice on short backpacking trips. Very easy to use and can fill up nalgenes quickly. Can also hang it from a tree and have a good water supply 'on tap' when camping near a source. Whole unit weighs 352grams/12.4oz (bladder, hose, bag). For me, I like the convenience and speed of this product. Used it from a lake source with pretty dirty water and it was fine. No way I'd wanted to have used an electronic system or chemical drops. I had wanted to buy the pump version of their product, but REI was out of stock so I bought this instead. I'm glad I did. The weight is similar is this is far easier to use.
Date published: 2015-11-28
Rated 1 out of 5 by from Clogged day one Just like dahlberg123, I just returned from a week in the Boundary Waters. I purchased the Katadyn Gravity 6L for this trip as I was looking for an alternative to pumping. This seemed like a great idea. After filling the reservoir from the middle of Nina Moose Lake on day two, the water-flow was like an IV bag - drip, drip, drip. I didn't have another cartridge -- I original cartridge should have cleaned more water than I could possibly need for the outing. Tried to field-clean but no use. Our trip was characterized by capturing the slow drip the whole time and boiling water. I do not recommend this product.
Date published: 2015-08-24
Rated 5 out of 5 by from MUCH faster way to filter water! We brought this on a 6 day trip in the Sierras. Filtered about 20 L per day keeping a group of 4 well hydrated. This is VERY fast, it would fill a 3L Nalgene Cantene so quickly you had to pay attention or it would overflow. Other suggestions / observations: 1) To enhance the process, I brought a 2L Coke bottle with the top cutoff. This allowed us to a) fill the 6L bag even from very shallow streams and b) keep refilling the bag while it hung in a tree, and refill multiple 3L Nalgene Cantenes (which are only 2.1 oz each) 2) Bought the Platypus universal bottle adapter, which allowed us to create a sealed path from the Katadyn to the Nalgene Cantene and allow near continuous water filtering with a protected path. 3) Being able to easily filter large amounts quickly saved time not only in the filtering process, but gave us a "surplus" of clean water so we could clean dishes and even clothing faster and easier. 4) Filter only displayed some slow down on the last day, to about .5 L / min. I did not try to clean in the field. Water on this trip was generally clear. I cleaned at home and it seems to be running close to the original rate, but have not retested in the field. Only negative comment is that since the filter is in the bag itself, and the top of the bag does not seal tightly, it was moderately difficult to get a good flow rate if there was no suitable tree to hang the bag, and we had to use a rock ledge. This is relative, as even "degraded" this filter outperformed any other we have used.
Date published: 2014-08-22
Rated 5 out of 5 by from Sooo much better than pumping Why didn't they think of this 20 years ago? - takes most of the work out of filtering water - We were dealing with chocolate colored river water, so it really helps to have an additional water bag to let silt settle in before pouring into filter bag - we also used a strainer with coffee filters to pre-filter - Manufacturer should design and sell a pre-filter system to fit the top of the bag -
Date published: 2015-06-17
Rated 2 out of 5 by from Worked great for about 20L, then it just dripped While planning for three weeks on the John Muir Trail, we purchased one of these a few weeks before and took it on some test hikes. 3-4 days in the backcountry. Worked great, No more pumping! Yay. And fast. Then August came and we hit the John Muir Trail, home of some of the cleanest, most excellent water sources in the country. Well, 10 days in it was down to a dribble (see the video). Assuming we filtered 6L of water each day, and including the four days we used it before the JMT we're talking about 100L of water to slow down to a crawl.
Date published: 2017-09-13
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Questions & Answers

What material is the bag made from?

Asked by: AAJJ
*UPDATE* Only partially true.  The bag is made by Ortleib and is based on their water sack with the addition of the clear window by katadyn.  I talked to the rep there and he said it is a nylon fabric impregnated with food grade polyurethane and is both PVC and BPA free however, they did not know what the plastic window was made from.  Their water sack is totally compatible with the Katadyn filters and so I just bought their system.
Answered by: AAJJ
Date published: 2018-01-17

Can this unit readily be hung in (or on) a backpack and used while hiking? Tips for doing so?  Thank you!

Asked by: Rob7
​Yes, this filter can be hung on backpack to filter water while hiking.
Answered by: REIservice
Date published: 2017-05-04

I already own the Hiker Pro. Does Katadyn have a variant of this product without the actual filter?

Asked by: natec
Unfortunately, we do not stock this item without the filter. We recommend contacting the Katadyn directly for additional information.
Answered by: REIservice
Date published: 2017-04-24

I can't find replacement filters anywhere online or in store -- are they available?

Asked by: MikeCB
The base camp uses the field cleanable Hiker PRO cartridge. This can be ordered from Katadyn:
Answered by: REIservice
Date published: 2017-04-01

I'm wondering why REI identifies the Katadyne's Water Filter System best use as "camping" and not "backpacking?" Is there a particular reason?

Asked by: rtheyden
Large capacity gravity filter systems are often aimed toward larger groups of campers due to the higher output. This filter can be used for smaller groups and solo backpacking as well.
Answered by: REIservice
Date published: 2017-05-24

I have this gravity filter but have lost the filter cap (the black round cap that goes on the bottom of the bag). It looks like we can not order caps separately. If I used the hiker pro filter cartige replacement would this directly connect to the hose?

Asked by: lhunt5000
​We're sorry that information is not available and we encourage you to contact the vendor Katadyn.
Answered by: REIservice
Date published: 2017-08-18

Will the hose on this filter connect to the quick release part on my platypus big zip lp water bladder for easy filling?

Asked by: Morgan Harper
These brands both use hoses with ¼ inch internal tubing diameters, so the quick connect adaptors can fit.
Answered by: REIservice
Date published: 2017-10-23

 Is this system able to be back flush to clean the filter 

Asked by: Brennan
No, as a gravity filter, it has a filter protector screen around the filter for large debris, and to clean the filter you simply rinse it off from time to time, making the maintenance simple for the lifetime of the filter.
Answered by: REIservice
Date published: 2017-08-29
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