Water filtration on a whole new level!!

I copied this product to a outdoor/survivalist website. This may sell a few quick and get more user ratings. I look forward to reading some reviews.

GM1
 
Hi, I was prepared to place an order until I read the comments by Kirby64 in post #54 regarding the purifiers inability to filter certain pathogens. Can you clarify this please.

Thanks
 
Hi, I was prepared to place an order until I read the comments by Kirby64 in post #54 regarding the purifiers inability to filter certain pathogens. Can you clarify this please.
Click to expand...


I have the purifier on my Grayl and so far have been drinking eaves trough water, stream water and melting snow from my truck bed. Still waiting for spring to try it on standing water.

However see below.




G3+ Technology
Replaceable Filters and Purifiers use triple charged mesh and activated carbon to capture odor, flavor, industrial and pharmaceutical chemicals, and heavy metals.

Filter (included) is designed for everyday use. It features one layer of G3+ technology and removes 99.99% of bacteria.

Purifier (optional) is designed for outdoors and international travel. It features two layers of G3+ technology and removes of 99.999% bacteria, protozoa and viruses.
Click to expand...


Which impurities are the GRAYL G3+ Filter and G3+ Purifier effective against?


Both the G3+ Filter and Purifier are effective against a broad range of impurities. They greatly reduce impurities that make water taste and smell bad, like chlorine, certain industrial and pharmaceutical chemicals and certain heavy metals commonly found in tap water. The G3+ Filter (included with the Water Filtration Cup) removes 99.99% of bacteria, such as E. coli, found when municipal water systems fail. The G3+ Purifier (optional) provides a higher level of protection, removing 99.999% of bacteria, protozoa (Giardia) and viruses (Hepatitas A, SARS). Tests were completed by a certified, independent laboratory according to NSF/ANSI standards 42 and 53
Click to expand...
 
Last edited:
And as Travis already mentioned.....


GRAYL doesn't rely on 'size exclusion' filtration like other filters with older technology. It uses this stuff - which was designed for NASA. http://www.spacefoundation.org/progr...m-superfilters

GRAYL starts with a base of non-woven ceramics (just like old filters) but our technology doesn't stop there. Instead of little, tiny holes in the non-woven ceramics, the 3D matrix of much bigger holes are filled with a positively-charged mesh.

Four advantages to our technology:
1. Faster water flow - much faster (2L/minute for the filter, 1L/minute for the purifier)
2. Improved pathogen removal
3. The mesh also binds an array of chemicals that activated carbon alone can't catch
4. Powdered activated carbon inside the matrix has a much higher surface area than granulated or 'block' activated carbon

Filter technology has come a long way. GRAYL is just the first to employ the new stuff!
Click to expand...



Here's a link to a review an more info.
 
Last edited:
I have had the Grayl for over a month and am quite pleased with it's form and design. I will be travelling for training and the source of water from the local supply can be iffy. At times it can be brown and smelly, ergo the grayl comes into play. I don't doubt for a minute the data info that Grayl or Farmboy are presenting. Face it in our litigieous society that we're in would these claims be made without supporting information?

I'm not an engineer, biologist or any formally trained scientist (infact I've never stayed at an Holiday Inn Express) and will not debate the pros or cons on the grayl's efficacy. It's a good product and appears to have decent peer reviews from other sources and that's good enough for me.

Farmboy, thanks for the prompt service and I do like my Grayl.
 
Last edited:
dagtaph said:
I want to welcome you to this forum and say that it is great to have an expert here :)
It is probably a stupid question but could you tell me what dis/advantages of your product as compared to UV light sticks which could be put into a glass of water to disinfect it.
Several people highly recommended those sticks to me.
Thank you very much.
PS: another question, quite gross :) is it possible to filter urine with your filter? Please again pardon my ignorance I know very little about filtering.
Click to expand...

Hi Dagtaph,
UV sticks are great because they weigh very little - if I was walking the Pacific Crest trail, it's probably what I would carry. Downsides - water must be perfectly clear or pathogens can hide in the 'shadows', don't remove bad stuff (only kill them), don't remove flavors/odors/chemicals, fragile (glass).

I suggest filtering the cleanest water you can find - and urine probably isn't it. GRAYL will remove many components of urine (lipids, proteins, some expelled chemicals.) It does not remove ionic elements (Calcium, Potassium, Magnesium, sodium etc).

All that said, if you are in a bind and have to drink urine, better to filter than not to filter.

Tm
 
Kirby64 said:
First of all I would strongly recommend NOT using this product on its own. Let me explain;
When dealing with potential potable water sources we look for things called pathogens. A pathogen is defined as anything that can cause a disease. In term of water treatment we look at 3 types of pathogens;
1. Bacteria
2. viruses
3 protozoa.
Out of the 3, only the protozoa can be removed by mechanic straining, as seen used with this cup. That leaves you open to two out of the three pathogens in water. Norwalk virus, salmonella and certain strains of the notorious E.coli bacteria are very commonly found in surface water. Viruses and bacteria are both susceptible to oxidation though, which is good news because chlorine is an extremely good oxidation agent, hence, why we chlorinate our water as part of the water treatment process. Overall, I would say this cup is only useful as phase one of creating potable water when in the woods. Always carry some chlorine tablets with you to be sure. Trust me guys!
source: I'm a certified level 1 operator with my OIT.
Click to expand...

Allow me to respectfully disagree, Kirby64. All three (bacteria, protozoa and virus) are susceptible to 'mechanical straining' or 'size exclusion'. The principle is simple - bacteria (and virus and protozoa) are much bigger than water molecules - so make holes bigger than water but smaller than pathogens - water passes through, pathogens don't.

GRAYL doesn't rely exclusively on size exclusion filtration. GRAYL combines size exclusion with ion exchange (which wikipedia explains better than I could). Then we add ultra-powdered activated carbon (much better than granulated AC or block AC) to remove many chemicals and many heavy metals.

Our technology has been tested many times to remove a very high percentage of bacteria, protozoa and viruses. I'm very happy to share our testing results (tested by independent labs) and share other scientific papers that have put our filter media to the test.

Send me an email info@thegrayl.com if you are interested.
 
elwoodpdowd said:
I have had the Grayl for over a month and am quite pleased with it's form and design. I will be travelling for training and the source of water from the local supply can be iffy. At times it can be brown and smelly, ergo the grayl comes into play. I don't doubt for a minute the data info that Grayl or Farmboy are presenting. Face it in our litigieous society that we're in would these claims be made without supporting information?

I'm not an engineer, biologist or any formally trained scientist (infact I've never stayed at an Holiday Inn Express) and will not debate the pros or cons on the grayl's efficacy. It's a good product and appears to have decent peer reviews from other sources and that's good enough for me.

Farmboy, thanks for the prompt service and I do like my Grayl.
Click to expand...

Thanks for that feedback, elwoodpdowd!

I'll repeat it, email (my address is the only one on the website - www.thegrayl.com ) and I'll be happy to share my test results for pathogens and chemicals.
 
The only issue I have is that I dropped my grayl and the end cap broke free. Looks like I might have epoxy it back on. Other than This it still works, just frustrating.
 
elwoodpdowd said:
The only issue I have is that I dropped my grayl and the end cap broke free. Looks like I might have epoxy it back on. Other than This it still works, just frustrating.
Click to expand...

Hey elwoodpdowd,

Sorry about your end cap.

We stand behind our stuff 100%. Message me privately with your mailing address and I'll send you a new outer cup.

Travis
 
Thank you for posting the reviews Travis. It leaves me with only three questions......1) Once the filter is used once, is there a life span or unlimited? 2) Is the filter damaged if it freezes (no water in the cup but may be damp)? and 3) Is there a use counter or an easy way to determine when the filter is exhausted?

Thanks

GM1
 
Glockman1 said:
Thank you for posting the reviews Travis. It leaves me with only three questions......1) Once the filter is used once, is there a life span or unlimited? 2) Is the filter damaged if it freezes (no water in the cup but may be damp)? and 3) Is there a use counter or an easy way to determine when the filter is exhausted?

Thanks

GM1
Click to expand...

Hey Glockman1,

1. The filter is good for 300 uses, 150L, 40Gal
2. We have yet to run freeze thaw cycle test on our cartridge (it's in our short-to-medium term testing plan). But the filter media has been tested independently and is not damaged by freeze/thaw.
3. We're working on that. Stay tuned.
 
TravisGRAYL said:
Hey Glockman1,

1. The filter is good for 300 uses, 150L, 40Gal
2. We have yet to run freeze thaw cycle test on our cartridge (it's in our short-to-medium term testing plan). But the filter media has been tested independently and is not damaged by freeze/thaw.
3. We're working on that. Stay tuned.
Click to expand...

I'm in the market for a water filter. I'm finding this thread very interesting, thanks for all the back and forth links and stuff. I may just pick one of these up.
 
You must log in or register to reply here.
Back
Top Bottom