Is this a joke?
Rick from Alameda: 
Maybe I didn't read between the lines, but once I got the tablets, I discovered that it takes FOUR HOURS to purify a liter of water! Who has the time to sit around and wait four hours before you can drink out of your water bottle? This stuff is less than worthless.
Micro-confusion, but good backup
daveywest: 
I bought these tablets because of widely available information on the net that they treat clear water in 15 minutes. Though the package says four hours, I'd been told it included instructions that the 4 hours was only needed when worries exist about cysts in your water source. New packaging omits any info about 15 minute treatments.Regardless, this purchase was for a backup system for my Katadyn Hiker Filter, and I think they will work well for that purpose. A couple of tablets stored in my emergency kit give me the peace of mind (and my wife at home) in the back country.
Micropur Tablets vs. Filtering
ToddS: 
I used Micropur MP1 tablets to treat water on a recent 4-day hike in the Tetons. Others in our group used a water filter. I think each method has its pros and cons, but I like the convenience of the tablets. They worked great since there is plenty of visibly clean, running water in the Tetons. We waited 30 minutes typically for treatment and had no problems at all with bacteria or viruses. The tablets do give the water a very slight change of taste, but it's quite subtle and not bothersome. We did not treat water for cooking since we boiled that. That helped to limit the number of tablets we needed to bring.
Micropur MP1 Tablets
Wise One:
The water tasted great, but in use, 4 hours is just too long to purify a quart of water.
Lightest & Safest Chemical Treatment
Jonathan Shefftz:
Unlike iodine, kills all the nasties, yet doesnt taste nasty. And unlike bottle forms of the same compounds, can just toss a few essentially weightless and individually sealed tablets in your pack for an overnight trip, as well as always keep some in your first aid kit. A piece of cheesecloth would be a good idea to filter out any debris before treatment. Only significant drawback is that this treatment would become fairly expensive on a per-liter basis.
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