Aug 21, 2012 at 4:28 pm #1293210
@maiaLocale: Rocky Mountains
Companion forum thread to:Aug 22, 2012 at 9:58 am #1904921
@wandering_bobLocale: Oregon, USA
"Note that the in-line filters can be easily back-flushed, but not the squeeze bottles (without some tricks)."
Please elaborate further. How does one back-flush a squeeze bottle filter successfully?
Inquiring minds want to know.Aug 22, 2012 at 2:53 pm #1905019
@moxfordLocale: Silicon Valley, CA
Instead of squeezing water out, you blow backwards through it, and then squeeze again?Aug 22, 2012 at 4:04 pm #1905048
@tarasbulbaLocale: Rocky Mountains
I have used a Bota of Boulder squeeze bottle filter exclusively for over a decade now; however, the water quality in Montana and the PNW is such that it probably doesn't need any filtering anyway…before I got the Bota I went 50 years without filtering and all to no ill effects. Unfortunately, the company seems to have gone by the wayside, at least I'm unable to find their replacement filters anymore. Fortunately Aquamira and Eddie Bauer both offer replacement filters that will substitute. When I can no longer find replacements then it will be time to upgrade to the Sawyer…I'm truly impressed by your unofficial review of their products. Thanks for the this sterling series!Aug 22, 2012 at 5:31 pm #1905081
@kentLocale: High Sierra
Assuming that's a serious question, you can backflush using Sawyer's syringe, or, from another thread here on BPL, you can use a Tornado Tube and a clean bag to force the water back through. You need to cut the Tornado Tube down a little, but it's very easy to do.Aug 22, 2012 at 5:39 pm #1905083
@wandering_bobLocale: Oregon, USA
I'm quite serious. The squeeze bottle filters – even those from Sawyer – do not come with a syringe. The author suggests that they can be backflushed successfully, but with difficulty. I want to know how to do so.Aug 22, 2012 at 6:28 pm #1905100
@kentLocale: High Sierra
I bought one Saywer several months ago (March?) and another for my wife in early July. Both came packaged with an assorted 3-pack of squeeze bags and the back-flushing syringe so I thought all are delivered that way.
Here are the instructions from a Sawyer bag: http://www.backpackinglight.com/cgi-bin/backpackinglight/forums/thread_display.html?forum_thread_id=65864
The syringes don't have any special back-flushing seal, you just firmly hold the plastic syringe to the plastic filter body and, quickly/forcefully run the plunger.
As for the Tornado Tube, sorry, I don't have the URL for the BPL thread, but here is one for the tube itself: http://www.amazon.com/Tornado-Tube-Tubes/dp/B0006Z8YBQ or something very similar.
Here is some of the relevant text of the BPL thread:
…since both the clean water bag and the filter are male-threaded, use this to connect for back flushing.
…I found you need to modify it by cutting (I used a bandsaw) about 1/4 inch off each end this allows [Sawyer and Evernew bags] and other standard drinking bottles to seat into the threads.
The Tornado Tube isn't hard/dense and I was easily able to cut it by hand (don't ask :-) ) using the blade from my recip saw.
I have used both back-flushing methods; they both work and are easy to do.
Hope this helps.Aug 22, 2012 at 7:03 pm #1905120
I have started using the sawer filter, at 2.5 oz dry. This has good flow, light weight, instant clean water, therefore I carry a little less. I feel the traditional pump filters are obsolete. I had been using Aqua Mira but after reading articles on the subject of water treatment I feel this Sawyer filter is better with only a few more grams of weight. I carry the 2 liter sawyer squeeze bottle,1 oz, for dirty water and additional water capacity as needed as well as extra water around camp. These bottles are not as robust as a platypus but with care will last a long time. you may want to get a package of spare bottles to keep in your bounce box. On trail I use only a 1 liter platypus with a drink hose kit. I purchased the Sawyer inline hose kit and use automotive vacuumn line caps to plug the inlet and outlet hose adapters. These work as effective plugs for the filter unit. When time to back wash I pull off the bite valve from the drink tube, connect it to the inlet of the Sawyer filter, remove the inlet plug, and squeeze the clean water platypus to back flush the filter. I use the filter only on questionable water so it goes a long time without back flushing.Aug 22, 2012 at 8:15 pm #1905135
I thought i was being pretty gentle with my Sawyer 32oz bag and the top seam started leaking in under 2 weeks on my LT trip. I just got a 1.5L Evernew bottle/bag 1.27oz and should be a lot more reliable.
mine also came with the Syringe for backflushing.Aug 22, 2012 at 11:34 pm #1905175
@hikinggrannyLocale: Gateway to Columbia River Gorge
Bob, mine also came with the syringe. Are you sure yours wasn't omitted from the box due to a packing error?Aug 23, 2012 at 7:15 am #1905232
I have heard that hollow fiber is fragil, if it freezes it is toast, if it is dropped it is toast. Any info on that?Aug 23, 2012 at 7:33 am #1905234
Definitely avoid freezing.Aug 23, 2012 at 10:22 am #1905290
@rayestrellaLocale: Northern Minnesota
What Bob is talking about is the 4-way bottle, not the Squeeze. The bottle (which I am squeezing water from in the picture) comes with a faucet adapter for backflushing at home. It does not come with any way to backflush in the field.
I can't answer for Roger, but the only way I can think of would be to rig a gravity bag, but that defeats the whole point of taking the bottle in the first place.Aug 23, 2012 at 10:54 am #1905309
Avoid freezing means another thing in the sleepingbag during some of the year. Will the filter be dry enough for that? The aquapure traveler or inline seems interesting! They take away chemicals as well which is nice when hiking in places where the rivers have passet farmlands and cities. I have not found any info on if they can handle freezing. Any other opinion on the aquapure?Aug 23, 2012 at 1:11 pm #1905372
Water will continue to seep out of the cartridge, so seal it in a plastic bag. Just keeping it in the shelter is enough protection for a few degrees below freezing, but it's best to keep it in the sleeping bag below that.
Ceramic and hollow-fiber media must not freeze–pleated media don't seem affected as long at the filter chamber is drained.
RickAug 23, 2012 at 3:47 pm #1905424
@valsharLocale: San Francisco Bay Area
I have been using the same 1st Generation "black" Sawyer inline filter since 2007 without any problems.
I use it as a gravity filter in camp, I have used it as a staw, and as a squeeze bag with Platypus bags on the JMT for 15 days last year, I have hooked it up to my faucet and blasted the water full pressure to backflush at home, run dilluted bleach through it to clean it out at home, and I have backflushed it in the field by squeezing clean water from the clean water catch bag in my squeeze bag and gravity filter setups….I have even backflushed it while using it as a straw by forcing the water filtered water in my mouth back through the filter.
My filter is still going strong and filters just as good as the first time I used it.
I have a detailed review in the user section here with photos of the inside of the filter to show the hollow fibers (newer ones are sealed so you can not poke around inside to accidentally damage them) and details how I have used it under less than idea conditions.
Yes, freezing is the one thing that can kill this filter, just as it can with any other sort of filter.
I suck the water out of the filter before storing to keep it as dry as possible.
I will then wrap my filter with a small hand cloth that I use like an all purpose wash cloth/bandana and then sleep with it in my bivy bag to keep it from freezing- easy.
The only other way to destroy it is if you manage to break the plastic housing that surrounds the hollow fibers or to snap off one of the inputs or outputs for the inline system, which I had a friend do. (Note: my friends is extremely rough with his gear and is the only guy I know who went light weight and then back to traditional because he was just to hard on lightweight gear).
Great to see the review here and that the Sawyer filter gets the attention that I think it deserves.
Hope there will be an additional review/write up on the Saywer here highlighting useage and tips to effectively use it.
Note: Playtpus bags do not thread well to the Sawyer Squeeze filter and requires modification to seat properly. Better off getting Evernew water bags that use a conventional threading.
Lastly, dropping the filter….I have not dropped mine all that much, but I can tell you that the casing on it is pretty tough. Mine has very visable nicks, scrapes, abrassions, etc…and is completely fine. It is not eggshell thin. I doubt that I could crush it with both hands if I tried to. Then again, I do have T-Rex chicken wings for arms. :)
-TonyAug 23, 2012 at 6:52 pm #1905480
@hikin_jimLocale: Orange County, CA, USA
What a great series of articles. The explanation of the new technology (hollow fiber) is worth the cost of my subscription alone. Thanks to Roger, Will, Rick, and Ray (did I miss anyone?) for working on this. SO much better information than anything else out there.
P.S. The photo of the mad scientist at work ;) made the article all the more believable. lol.
Aug 23, 2012 at 7:12 pm #1905491
Oh, I just bought a Sawyer Squeeze filter. I'm glad it makes my old Pur Hiker filter obsolete because that filter was big and heavy and, in any case, it stopped working 2 months ago on a backpacking trip in spite of the installation of a costly new filter element. Into the trash bin with you! I was a little nervous about the Sawyer filter's efficacy because of the small size, but now Rodger has arrived like a knight in shining armor to slake my doubt about the comparatively minuscule Sawyer. Thanks Rodger–and Sawyer too!Aug 24, 2012 at 12:45 am #1905561
Any chance the author or someone else could comment on the http://www.bwtechnologies.com ability to take away potential chemicals from rivers with farmlands and possibly factoires upstreams? I´ve looked at their webpage and the tests but it does not really tell me if it would be useful or not. Where I´m hiking the majority of my hikes I can choose between safe sources such as taps or well but that means carrying 3-5 liters or take water from rivers or creeks with chemicals from farmlands. That is why I am so keen on understanding the potential of the http://www.bwtechnologies.com
Thanks in advance.Aug 24, 2012 at 9:43 am #1905634
No, their media will not remove chemicals or metals so would not be an appropriate match for municipal, industrial or agricultural waste removal.
The only portable technology that would is reverse osmosis. Katadyn makes portable R/O filters aimed at boaters. They're heavy and expensive but in certain cases could be preferable to lugging large quantities of water. (Note: Carbon can remove certain chemical and metal contaminants via adsorbtion but is not effective for all and the required carbon quantity and contact time differs for every contaminant. It's not an answer for unknowable contaminant mixes and concentrations.)
RickAug 24, 2012 at 6:34 pm #1905847
Is there a way of testing a Sawyer filter's integrity?
How can one be sure the filter did not accidentally freeze or sustain damage from a fall / impact?
Wouldn't it be nice if there was a way of proving it works, even just for peace of mind – like can be done with the MSR product?
This is the one thing that has kept me from buying one.Aug 25, 2012 at 7:04 am #1905921
@retiredjerryLocale: Oregon and Washington
"Q. Can the filter be frozen?
A. While we have no proof that freezing damages the filters we have no proof that it does not. Therefore we must recommend replacing the filter if you suspect it has been frozen."
From article, Roger says when you backflush, the tubes expand a little which helps dislodge any blocked pores.
If the tubes were full of water, froze, and expanded a little it doesn't seem like it would burst the tubes.
Putting filter in your sleeping bag doesn't seem like a very good solution. Hard to reliably keep your filter from every freezing over many trips. Before and after sleeping you'de have to carry it in your pocket?
Too bad there isn't some way to test a filter after it's been frozen a bunch of times.
I am tempted to just shake the filter out really good if it might go below freezing.
Besides, you don't really need to filter the water anyway. This is just a made-up issue so filter manufacturers can sell filters : )Aug 25, 2012 at 7:59 am #1905933
@hknewmanLocale: Western US
I definitely needed this update in the latest in water treatment. I'd gotten away from filters after a popular but now defunct brand's best seller shattered. Pressed down on the plunger and the body cracked into many pieces.Aug 25, 2012 at 9:59 am #1905952
@retiredjerryLocale: Oregon and Washington
I had a PUR and it cracked when I pressed on plunger. It still worked good enough for that trip, then I put tape on it and used it for a few more trips.Aug 25, 2012 at 10:48 am #1905961
"Putting filter in your sleeping bag doesn't seem like a very good solution."
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