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Solar Bag - Water filtration as you ride

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Solar Bag - Water filtration as you ride

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Old 08-01-12, 04:21 AM
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Aushiker
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Solar Bag - Water filtration as you ride

This has popped up at Gizmag; it is called a Solar Bag. It looks like it could be option for bicycle touring.

However, while PET bottles can usually only purify up to three liters per every six hours of sunlight, the Solar Bag's makes claim that its combination of high clarity polyethylene and black polyethylene allows the device to purify 2.5 gallons (9.4 liters) in the same time-span, and that it will start working on the purification process while still being transported. These two differences could potentially save lives, making the Solar Bag project an exciting prospect, even in this early stage of development.


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Old 08-01-12, 04:56 AM
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Counting on six hours of direct sunlight while riding is difficult. This became clear to me while experimenting with solar charging a few years ago. It might work in sunny desert type areas but there the problem is finding water.
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Old 08-01-12, 05:04 AM
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Wow I guess I missed the boat on that one. I had dreamed up something like that after reading about the steri pens. It seems like a great idea for some applications. Probably not necessary or effective for most bike tours though. BTW the time to purify could be cut drastically if the layer of water was thinner. Of course that cuts capacity for the given area.
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Old 08-01-12, 07:36 AM
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Originally Posted by staehpj1 View Post
Wow I guess I missed the boat on that one. I had dreamed up something like that after reading about the steri pens. It seems like a great idea for some applications.
I don't believe it has gone into production yet so maybe you have a chance

Probably not necessary or effective for most bike tours though.
Not for most but if you are areas of high sunlight and water problems it could be a possibility. I could see use for it here in Australia for example.

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Old 08-02-12, 10:07 AM
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Am I missing something here? I have a filter that will instantly purify water at a very quick rate and kills bugs/viruses while removing chemicals and floaty bits. I get 125 gals from one filter cartridge. Yes, itīs a bit heavy at 15 oz, but itīs nice to know that I can go to any water source and be able to drink instantly without having to wait and then drink warm water or lug water around.

BTW, if you carry a small eyedropper of bleach with you, you can add one drop to a liter of water, wait 15 mins. and also have perfectly safe water. Of course, that doesnīt filter out any floaty bits, change the color or help the taste, but in an emergency, itīs good to have something.
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Old 08-02-12, 11:28 AM
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IMO, the Platypus Gravityworks is the filtration system to beat now. Everything else just adds weight, complexity, effort, and/or a funny taste.

http://cascadedesigns.com/platypus/f...filter/product
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Old 08-02-12, 12:26 PM
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Originally Posted by Simon Cowbell View Post
IMO, the Platypus Gravityworks is the filtration system to beat now. Everything else just adds weight, complexity, effort, and/or a funny taste.

http://cascadedesigns.com/platypus/f...filter/product
My first reaction was that it was probably like some of the bottle filters that do not have a small enough pore size to be effective. So I checked and it is the same as my MSR Sweetwater. I was impressed, but then was a bit disappointed when I looked at the other specs. To summarize:
  1. I was happy to see that it had the same 0.2 microns pore size
  2. I was happy to see that you didn't need to pump it
  3. I was disappointed that it cost substantially more
  4. I was disappointed that the replacement elements cost more
  5. I was disappointed that it was actually slower than the Sweetwater
  6. I was disappointed that it weighed almost as much as the Sweetwater

Bottom line... If I didn't have a filter I would consider it, but it wouldn't be a slam dunk. I will stick with the Sweetwater.
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Old 08-02-12, 12:45 PM
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I use a Sawyer 0.10 micron inline filter that only weighs 4.3 ounces with a sipper cap for a water bottle. I can do gravity filtering by combining it with a Platypus bladder (3.2 oz).
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Old 08-02-12, 04:21 PM
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Originally Posted by staehpj1 View Post
My first reaction was that it was probably like some of the bottle filters that do not have a small enough pore size to be effective. So I checked and it is the same as my MSR Sweetwater. I was impressed, but then was a bit disappointed when I looked at the other specs. To summarize:
  1. I was happy to see that it had the same 0.2 microns pore size
  2. I was happy to see that you didn't need to pump it
  3. I was disappointed that it cost substantially more
  4. I was disappointed that the replacement elements cost more
  5. I was disappointed that it was actually slower than the Sweetwater
  6. I was disappointed that it weighed almost as much as the Sweetwater

Bottom line... If I didn't have a filter I would consider it, but it wouldn't be a slam dunk. I will stick with the Sweetwater.
It's worth considering that the Platypus also has a water bottle included in the weight, so you can call it multi-use and shave off 2 oz or so for the clean bladder. If you were going to camping someplace dry, you could even pack in the dirty bladder full of (Dirty) water. It looks like you could carry in 8 liters of water, more than enough for a day or two of dry camping. The Sweetwater just gets you a filter.

Then again, I have a Steri-pen and I'm pretty sold on it.
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Old 08-02-12, 05:06 PM
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Pete, wrt your number four, the Platypus cartridges look to be less expensive than Sweetwater's on Amazon. They're actually closer to the cost of BA's Sawyer, which seems like a replacement worth considering if you've already got the reservoir bag, which I do.

And as far as number five goes, I'd be happy to race ya. ;-)

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Old 08-02-12, 09:36 PM
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Looks like a bad idea

A solar panels is much lighter by itself and you can get a steripen to filter the water

I personally use an MSR miniworks
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