See also:

• Recreation: Outdoors: Equipment: Water Purifiers  (0)
• Shopping: Home and Garden: Kitchen and Dining: Water Treatment  (100)

Aerobic Oxygen - - Makes and sells an additive for purifying water.

Arctic - - Sells British Berkefeld and Doulton water filters and cartridges.

James Filter - - Carries British Berkefeld and Doulton water filters and cartridges.

Katadyn - - Sells water purification filters. Also includes online versions of the original instructions.