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Boundary Waters Quetico Forum :: Gear Forum :: Gravity Filter Recommendations
 
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Tomcat
10/05/2023 10:56AM
 
Go Flow Water Gravity Bag with Versa Flow Water Filter
 
TrailZen
10/04/2023 07:41AM
 
Another testimonial for Platypus here--we've been using a 4L for years and no issues. Backflush after each use, disassemble and completely dry before storage at season's end, and it seems to work forever.


TZ
 
portagerunner
10/03/2023 04:12PM
 
Platypus works great, have been using mine for many years now. On bigger group trips we bring two. Would never go back to a pump system.
 
straighthairedcurly
10/04/2023 12:59PM
 
kenpark23: "Cnoc bags. Versa Flow filters. " +1
 
Banksiana
10/03/2023 07:51PM
 
Have to jump on the Platy 4L bandwagon. I back flush at the end of every session and the filter seems to be as quick as it was when I bought it. A fairly painless solution if you need filtered water.
 
deerfoot
10/03/2023 09:37PM
 
I use the Platypus 4L system and it works flawlessly with only minimal maintenance.
 
HighnDry
10/28/2023 06:01PM
 
CNOC bags and versa filters also.
 
mnriver
10/29/2023 09:31PM
 
I use a Sawyer filter and put together my own setup. For untreated water I use an inflation bag that came with my air mattress, I found a pex fitting that worked perfectly to go from the bag to the filter hose. Then on the clean side it drains into a 5 gallon blue water jug. That setup is great for larger groups and higher temps when we're going through a lot of water, and I travel with the water jug empty.


I find myself back flushing the filter once per day, and give it an extra good rinse when I get home.
 
bobbernumber3
10/04/2023 07:43AM
 



Pick up a Sawyer filter at Wal=Mart for $20-25 and fab-up a system that meets your needs.
 
unshavenman
10/03/2023 10:57PM
 
Yep, get yourself a Platypus 4L or 6L water filter and a Platy Water Tank and you will be good to go.
 
bobbernumber3
10/09/2023 12:48PM
 
sueb2b: "I use the Platy bags with a Sawyer filter. Some backflushing is usually needed, but that’s simple. Also have Nalgene collapsible 96oz containers. "


The threads on my platy do not match the threads on my Sawyer filter.
 
MossBack
10/09/2023 12:20PM
 
My platypus 6 liter system came today. Seems like a good piece of gear. Although it is a bit wonky to get back in the bag.
 
papalambeau
10/11/2023 11:25AM
 
cowdoc: "I'm one of the dissatisfied Katadyn owners that took a hack saw to the filter and did some other tinkering, bought 2 Sawyer in-line filters and have been satisfied with results. I like the toughness of the bag and ease of filling it. Filters backflush easy.
"

Our crew has done the exact same with our Katadyn and we have been using the same Sawyer in-line filter for years now.
 
MossBack
10/12/2023 08:17AM
 
Thanks for the tip
 
chessie
11/01/2023 02:56PM
 
Platypus, but buy two for a second "dirty" water bag. Work great, best we've found thus far.
 
kenpark23
10/03/2023 12:18PM
 
Cnoc bags. Versa Flow filters.
 
Sparkeh
10/04/2023 05:31AM
 
We like the lifestraw mission. Its a purifier too so it can filter out viruses unlike regular filters.
 
Speckled
10/03/2023 11:57AM
 
For years, I've just used a MSR pump for my trips, only bringing with the Katadyn Gravity Filter on family trips, which meant sometimes the filter would sit for a few years between uses.

This last trip, there were four of us and I set up the Katadyn and went to drink the water - it has the strongest chemical taste, that like literally burned my lips and tongue. I don't know if the filter just degraded and was breaking down or what happened to it, but it was BAD.

So - I need a replacement. What does everybody like today?
 
HowardSprague
10/03/2023 02:22PM
 
Rented a Platypus GravityWorks from Rockwood last year, and it worked great. Slowed down a few times, but they showed us how to backflush it out, so all was good!
You maybe want to just replace the cartridge on yours, I usually do so with my Katadyn Hiker.

 
OCDave
10/03/2023 07:03PM
 
I had 2 sons matriculate through Boy Scouts separated in age by just enough that I spent 12 years as a driver for weekend and summer camping trips. I have had the opportunity to use just about every water filter available including: my own MSR Waterworks, Sawyer squeeze and Sawyer squeeze mini filters.


By far the easiest and fastest filter I found was the Platypus GravityWorks 4.0 liter. I use this for groups as big as 12 or as small as just me traveling solo. It is light, has no moving parts and basically self cleaning in the field.


Good Luck
 
bwcadan
10/04/2023 03:23PM
 
TrailZen: "Another testimonial for Platypus here--we've been using a 4L for years and no issues. Backflush after each use, disassemble and completely dry before storage at season's end, and it seems to work forever.



TZ"



No science for this opinion, however, I believe taking my Sawyer filter and soaking it overnight in water before taking our trip helps its efficiency and effectiveness. Use filtered water if desired.
 
cowdoc
10/04/2023 05:15PM
 
I'm one of the dissatisfied Katadyn owners that took a hack saw to the filter and did some other tinkering, bought 2 Sawyer in-line filters and have been satisfied with results. I like the toughness of the bag and ease of filling it. Filters backflush easy.

 
ultralight
10/05/2023 12:37AM
 
Sawyer squeeze as an in-line filter. Love the company mission and love the simplicity of the filters. They just simply work at a reasonable cost.
 
sueb2b
10/06/2023 10:29AM
 
I use the Platy bags with a Sawyer filter. Some backflushing is usually needed, but that’s simple. Also have Nalgene collapsible 96oz containers.
 
Banksiana
10/10/2023 08:42AM
 
MossBack: "My platypus 6 liter system came today. Seems like a good piece of gear. Although it is a bit wonky to get back in the bag."


I pack the filter line and clean bag in the Platy bag. I put the dirty bag in a small stuff sack and stash it in the zipper pocket of my small pack. Pull it out at the end of the last portage and fill it in the center of the lake before landing at camp.


My only criticism of the Platy is how difficult and unreliable the closure is on the dirty bag- I strap it around my leg for the paddle into camp so it doesn't spill into the bilge. The carbon filter addition is money well spent- removes the vegetative after taste; water becomes exceptional for drinking.
 
brulu
10/18/2023 01:23AM
 
Speckled: "This last trip, there were four of us and I set up the Katadyn and went to drink the water - it has the strongest chemical taste, that like literally burned my lips and tongue. I don't know if the filter just degraded and was breaking down or what happened to it, but it was BAD."

I was just reading on the MSR website that tannins can react with disinfectants and cause a bad taste in subsequently treated water. If that's true then it might behoove a person to thoroughly flush/backflush with plain water before disinfecting after a trip where high-tannin water was run through the filter.

(click here and scroll to the question about how will tannins affect my filter)
 
mgraber
10/17/2023 10:53PM
 
Another vote for Platypus Gravityworks. Have tried a few and I like it best. It is like having a faucet in camp and the filter will last a long time if maintained properly.
 
canoeist1953
10/15/2023 12:52PM
 
I put together my own gravity system about four years ago. Used a Sawyer Double Threaded Mini water filter. The Double Threaded version (I got from amazon) includes extra hardware needed to make a hanging system. I needed to also buy bladders (I used Evernew) and hoses I bought at the hardware store. The Double Threaded Mini is threaded on both ends of the filter.


If you use a hose that hangs below the filter to use suction to pull water through it, use a small enough hose so that you do not have an air filled hose with a rivulet of water flowing down, larger diameter does not develop suction. I think mine is 0.170 inch inside diameter if my memory is correct.


The little filters like the Sawyer, Platypus, etc., work best if you frequently backflush. The Sawyer ones can be held against a Smartwater brand bottle with a flip top lid (only some of their bottles have that lid) to quickly give it a quick backflush. I use that to backflush mine every time I use the filter with an ounce or two of water. The more you use it without a backflush, the more compacted any particulates will get that can clog it.


I also back flush mine before and after every trip in the kitchen sink with tap water with the syringe, if you get air in the filter that can slow water flow through it so a robust backflush can help.


Buying a complete package makes sense, but I am a retired engineer so I chose to put together my own parts instead.


ADDENDUM:
I figured out how to add a photo. Using a paddle to hold the upper bladder up above the lower bladder.

 
sns
10/18/2023 01:25PM
 



Sawyer Squeeze under a Cnoc 3L & over a 1L smartwater bottle. I also use a 2L Evernew bottle below in place of the smartwater.


For 3 or fewer folks, this works great. More people and I'd ether do two of these (nice redundancy) or a bigger system.


9 ounces for the whole thing - including both clean-side bottles.


Also serves as a 5-minute shower.