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See also:
 | - Aerobic Oxygen
- Makes and sells an additive for purifying water.
http://www.oxygenforlife.net/
|
 | - Arctic
- Sells British Berkefeld and Doulton water filters and cartridges.
http://www.arctic-1.com/filters.htm
|
 | - James Filter
- Carries British Berkefeld and Doulton water filters and cartridges.
http://www.jamesfilter.com
|
 | - Katadyn
- Sells water purification filters. Also includes online versions of the original instructions.
http://www.katadyn.com/
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