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Change the filter for clean, tasty water anywhere you go.

Improve the water quality and filtration time of your MyBottle and Exstream personal water purification systems with the replacement Katadyn Exstream Virustat Kit. Change the filter when water doesn’t taste as clean as you like or the filtration process slows, which occurs after five months of moderate use. The three-part kit features a replacement pre-filter, cyst filter, and ViruStat cartridge that works together to remove over 99.9% of waterborne cysts and protozoa (Giardia and Cryptosporidium) and also kills over 99.99% of waterborne viruses.

  • Max usage: approx. 26 gallons (100 liters) of pure water

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Here's what others have to say...

is this the replacement filter for the...

is this the replacement filter for the MyBottle microfilter?

no, the microfilter needs a different replacement that backcountry does not seem to sell.


Great Versatility...

    So here we go peeps... If you need a bottle that can filter almost anything(except maybe biohazardious waste), need something almost bomb proof and something that makes you look like you know what you are doing 20 miles into the wilderness, this is the product for you!
    Can't say enough good things about it. The only hangup is the fact that it takes a hefty grip to get the H20 flowing, but what do you expect, there are multiple filters in which the water has to channel itself through. Bottom line: Get this bottle if you are a serious outdoor enthusiast and need something on the go!


    goes the distance

      great filter that fits easily in the bottle and light weight. good for about 200 fill ups. a little pricier than some of the other filtration systems but you get what you pay for.

      Get a Berkey botttle and dont waste your time with junk