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From Fellrnr.com, Running tips
m
→AltiPower
* Replacement silos (CO<SUB>2</SUB> scrubbers) are $22
===AltiPower===
AltiPower uses a system that removes the CO<SUB>2</SUB> from the exhaled air that is then rebreathed. It is not clear how long the cartridges last, or what altitude is achieved. The system appears equivalent to AltoLab, but significantly more expensive. http://www.altipower.com
* AltiPower Pro Kit, $1,000. Comes with 2 cartridges and Oximeter
* Replacement cartridges $100 each, $300 for four
==Pressure Swing Absorption==
Note: Apparently CAT, Hypoxico, and Higher Peak use generators from the same supplier, but at significantly different prices. The units appear physically identical.