Forum Index > Food & Grub > purifying water with bleach
 Reply to topic
Previous :: Next Topic
Author Message
oldwild
Member
Member


Joined: 02 Sep 2020
Posts: 25 | TRs | Pics
Location: snoqualmie
oldwild
Member
PostMon Feb 14, 2022 7:01 pm 
Hi.  Just wondering.  They often list purifying drinking water during weather emergencies with something like 4 drops of bleach per quart of water.  Has anyone done this while backpacking?  I normally carry a filter pump and iodine tablets as a backup, but this might be an option.  Has anyone used this method?

Back to top Reply to topic Reply with quote Send private message
Damian
Member
Member


Joined: 18 Dec 2001
Posts: 3245 | TRs | Pics
Damian
Member
PostTue Feb 15, 2022 9:49 am 
I used to do this back in the day. Never had a problem. I even wrote to Clorox who responded in writing, validating the safety and effectiveness of this process. Very cheap and a jug will last a lifetime. Best if mild notes of bleach agree with you.

Back to top Reply to topic Reply with quote Send private message
Geography Nerd
Beer Tester



Joined: 05 Dec 2004
Posts: 238 | TRs | Pics
Location: Tacoma
Geography Nerd
Beer Tester
PostTue Feb 15, 2022 10:49 am 
Many municipal drinking water utilities add sodium hypochlorite (bleach) into the water supply to disinfect the water. Depending on how close you are to a well/pump station you may notice a slight bleach smell (I do sometimes).

They will often add extra bleach after construction or when putting new infrastructure into service.

Back to top Reply to topic Reply with quote Send private message
zimmertr
TJ Zimmerman



Joined: 24 Jun 2018
Posts: 644 | TRs | Pics
Location: Newcastle
zimmertr
TJ Zimmerman
PostTue Feb 15, 2022 11:38 am 
You might find this post on /r/ultralight from yesterday interesting.

It is a discussion about this video by Gear Skeptic discussing water treatment via filtration.

This is the third video in a series. The second one discusses chemical treatment. Which is a bit more relevant to your topic.

My takeaway is that if your water source is large and obviously not contaminated (think large lake) then chemical treatment will be more than enough in our area of the world.

--------------
Flickr | Strava
Back to top Reply to topic Reply with quote Send private message
Malachai Constant
Member
Member


Joined: 13 Jan 2002
Posts: 15576 | TRs | Pics
Location: Back Again Like A Bad Penny
Malachai Constant
Member
PostTue Feb 15, 2022 12:36 pm 
The pills sold instant aqua etc are sodium chlorite or chlorine 2 for hot tubs and pools for about $10 for 2 lbs. Psychos think it's good for you but a teaspoon is enough for a 100 gal tub be careful.

--------------
"You do not laugh when you look at the mountains, or when you look at the sea." Lafcadio Hearn
Back to top Reply to topic Reply with quote Send private message
Randito
Snarky Member



Joined: 27 Jul 2008
Posts: 8752 | TRs | Pics
Location: Bellevue at the moment.
Randito
Snarky Member
PostTue Feb 15, 2022 4:09 pm 
The WA department of health offers this guidance.  5 drops per liter + 1 hour at room temperature.

https://www.doh.wa.gov/Emergencies/BePreparedBeSafe/SevereWeatherandNaturalDisasters/WaterPurification

Note that chlorine is ineffective against Cryptosporidium.   Boiling is the low-tech solution to killing Cryptosporidium.

Back to top Reply to topic Reply with quote Send private message
Chief Joseph
Member
Member


Joined: 10 Nov 2007
Posts: 6717 | TRs | Pics
Location: Verlot-Priest Lake
Chief Joseph
Member
PostTue Feb 15, 2022 5:54 pm 
Cats like the smell of bleach so it must be ok.  wink.gif

--------------
Go placidly amid the noise and waste, and remember what comfort there may be in owning a piece thereof.
Back to top Reply to topic Reply with quote Send private message
Bosterson
Member
Member


Joined: 12 Sep 2019
Posts: 220 | TRs | Pics
Location: Portland
Bosterson
Member
PostTue Feb 15, 2022 9:38 pm 
Why not just splurge on a Steripen? I have the USB rechargeable one and it's good for 1-2 people for probably 3-4 days as long as you only use it on drinking water vs cooking water. (I've met people who filter their cooking water... Which they then boil. What?) If you take a power bank or backpack with a solar panel, as people do these days, you could probably keep it topped off indefinitely. Bonus points for no extra flavor in your water.

--------------
Go! Take a gun! And a dog! Without a leash! Chop down a tree!  Start a fire! Piss wherever you want! Build a cairn! A HUGE ONE!
BE A REBEL! YOU ONLY LIVE ONCE!

(-bootpathguy)
Back to top Reply to topic Reply with quote Send private message
jinx'sboy
Member
Member


Joined: 30 Jul 2008
Posts: 752 | TRs | Pics
Location: on a great circle route
jinx'sboy
Member
PostTue Feb 15, 2022 9:54 pm 
Back in the day……we used bleach, sparingly, to deal with a “bad” test when we sent in water samples from a FS campground water system.  These systems typically involved underground cisterns, loooong runs of small diameter -  sometimes ancient iron/plastic - pipe.  And wells and/or pipes running from a spring.

Bleach…in some quantity.  Let it sit, run the faucet or spigot for a while.  Let it sit again for a bit…then let the water run again.  Repeat as needed.

Test again.  OK? cool.
If not OK - do it all again.  And test again.
Seldom failed.

I recall that was a monthly test, by County requirement.

Back to top Reply to topic Reply with quote Send private message
InFlight
coated in DEET



Joined: 20 May 2015
Posts: 808 | TRs | Pics
Location: Seattle area
InFlight
coated in DEET
PostWed Feb 16, 2022 11:53 am 
I normally use a filter, currently BeFree.  I have used the Sawyers, and still own the MSR Cartridge.  I have a MSR Trailshot in my day-hiking bag.

I've also tried my son's Grayl, which is suppose to filter viruses as well.  Weighs 11 ounces.

However I always carry eight Chlorine Dioxide tablets as a backup.  They weigh next to nothing (0.2 ounces).  Chlorine Dioxide with a minimum 1 hour (longer with cold water) will kill all.

The issue with pure Chlorine (or Iodine) is it not very effective for any Protozoa (Giardia or Cryptosporidium)

The other advantage of carrying some chemical, is you can double treat (filter & chemical) some questionable water sources.

I own a Steripen, but I seldom bring it along. If I was going someplace with known bad water it would be a nice non-chemical secondary treatment.   I simply decided depending on a battery powered device (even with a spare battery) as a primary water treatment wasn't my preferred option.

--------------
“I went to the woods because I wished to live deliberately...”  ― Henry David Thoreau
Back to top Reply to topic Reply with quote Send private message
Navy salad
Member
Member


Joined: 09 Sep 2008
Posts: 1773 | TRs | Pics
Location: Woodinville
Navy salad
Member
PostSun Apr 17, 2022 1:46 pm 
InFlight wrote:
Chlorine Dioxide with a minimum 1 hour (longer with cold water) will kill all

According to the CDC, even Chlorine Dioxide only has "low to moderate" effectiveness at killing Cyptosporidium.
Quote: "Methods that may remove some or all of Cryptosporidium from drinking water are:
-   Boiling (Rolling boil for 1 minute) has a very high effectiveness in killing Cryptosporidium;
-   Filtration has a high effectiveness in removing Cryptosporidium when using an absolute less than or equal to -   1 micron filter (NSF Standard 53 or 58 rated “cyst reduction / removal” filter);
-   Disinfection with iodine or chlorine is not effective in killing Cryptosporidium;
-   Disinfection with chlorine dioxide has a low to moderate effectiveness in killing Cryptosporidium;
-   Combination filtration and disinfection has a very high effectiveness in removing and killing Cryptosporidium when used with chlorine dioxide and an absolute less than or equal to 1 micron filter (NSF Standard 53 or 58 rated “cyst reduction / removal” filter)."

Back to top Reply to topic Reply with quote Send private message
InFlight
coated in DEET



Joined: 20 May 2015
Posts: 808 | TRs | Pics
Location: Seattle area
InFlight
coated in DEET
PostMon Apr 18, 2022 3:40 pm 
Filter and chemical water treatment is rated on a Logarithmic Reduction Value scale

1=90%
2=99%
3=99.9%
4=99.99%
5=99.999%
6=99.9999%
7=99.99999%

Most Filters are Log 7or 6 for the Larger Bacteria. For protozoa, (Giardia, Cyptosporidium) most have a log 6 or 5 reduction.   Water filters are not effective against any virus.

"Effective" against Cyptosporidium is thus a Log 5 reduction.
The published data suggests Chlorine Dioxide is around Log 3 reduction for Cyptosporidium, thus moderate compared to log 5.

I'm wasn't advocating Chlorine Dioxide as a primary treatment.   However, water filters can clog or freeze.
At a 0.2 ounces for a backup option to adequately treat eight water bottles, it's a cheap and light insurance in the back-country.

--------------
“I went to the woods because I wished to live deliberately...”  ― Henry David Thoreau
Back to top Reply to topic Reply with quote Send private message
jimmymac
Zip Lock Bagger



Joined: 14 Nov 2003
Posts: 3702 | TRs | Pics
Location: Lake Wittenmyer, WA
jimmymac
Zip Lock Bagger
PostWed Jul 13, 2022 12:59 pm 
I used to screen my water or melted snow through tighly woven fabric, into a bottle.  Then, I'd treat that bottle with a chlorine dioxide tablet.  I still use the screening disc for removing visible debris from the collected water, but I now squeeze the "raw" water out of the collection bottle, through an inline filter.  (Pre-screening makes the filter perform better, longer.)

I still carry a few chlorine dioxide tabs, since they weigh nothing and can't roll down a snowfield. rant.gif   But quitting the tablet disinfection keeps my gut's beneficial bacteria from being hit with the chlorine residual.

--------------
"Profound serenity is the product of unfaltering Trust and heightened vulnerability."
Back to top Reply to topic Reply with quote Send private message
   All times are GMT - 8 Hours
 Reply to topic
Forum Index > Food & Grub > purifying water with bleach
Jump to:   
Search this topic:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
   Use Disclaimer Powered by phpBB Privacy Policy