Meissner Filtration Products, Inc.
Manufactures microfilters, microfiber filters, and filter housings.
http://www.meissner.com/

Cascade Designs, Inc.
Cascade Designs is a manufacturer of performance outdoor equipment, Therm-a-Rest self-inflating mattresses, Platypus flexible hydration systems, SweetWater microfilters, Packtowl super-absorbent camp towels, SealLine dry bags and kayak rudder systems, and Tracks staffs and poles.
http://www.cascadedesigns.com