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Originally posted by Creedo
has anyone here used one of those new UV light filters? They are very small and lightweight and supposedly they do a very good job at killing all microbes within a container of water.
Anyone have any first hand knowledge of these kinds of filtration?
Originally posted by I See You
If you plan on doing long backpacking trips then I suggest you factor weight in. Sometimes even the smallest weight can put a burden on you physically and mentaly. Depending on how much water you need to cook with and filling bladder or canteen should be considered. I love my katadyn hiker, it's small and lightweight but pumping large amounts takes a bit. It;s great for week trips when you can leave the tent or lean-to to hit some summits and return to camp. I primarily hit the Adirondacks because it's close. If you get a chance you must hit some peaks in the Adirondacks. It's beautiful there.
[edit on 6-1-2007 by I See You]
Originally posted by Terapin
Sure, passing an electric current through water will indeed kill off bacteria etc., But, how long will that battery last? I have spent months at a time in the wild with my Katadyn filter. A battery would have been long dead. Good for short term use perhaps, but not something I would recomend for more than a weekend. Katadyn filters are issued to many NGOs and Aid organisations due to their rugged nature and proven long term effectiveness. My single Katadyn filter will get me 13,000 gallons of filtered water, how much will a single battery give me?
The units already have a carbon (activated charcoal) unit that comes with the water pitcher units. The thing is: You have to keep buying the carbon filters. What you're not told, as you can surmise from the above, is that you can boil or steam them for 5 minutes or so and reactivate the carbon elements---some more expensive units allow you to do this. If not, replace with virgin carbon.
However, there is some concern here. Because the temperatures for this second reactivation do not reach the 500 to 900 degrees C that some technical material calls for. But, High Capacity Water Filter (see below) with a carbon filter says its filters can be recharged by this method---boiling them for 5 minutes in water to evaporate chlorine used in chlorine treated water. We suggest the water be filtered.
Nevertheless, if you (a) boil out your filters, then you could try backflushing first. But, since the incoming port to the filter screen is so small, compared to the outport screen, you may not be able to backflush the refuse (contaminates) out sufficiently, by forcing clean water from the outport screen through the import screen. Then, pour (b) hydrogen peroxide (H2O2) through the outport screen until the filter is saturated. Let rest for 15 to 20 minutes to kill microorganisms; then boil for 10 minutes. We did our Brita® as such and it did not melt, and it works beautifully. If this does not work for you, after testing your spent filter, then replace the filtering unit(s) if you stored enough; or, make your own (see below) using Activated Carbon (charcoal).