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==Recommendations==
I believe that the [[DIY Altitude Training]] (or similar [[AltoLab]] system ) is the most cost effective solution. For those wanting a sleep based system, Higher Peak offers the best value.
==Rebreathers==
Chemical generators use a chemical reaction to either remove oxygen from the air, or to remove the carbon dioxide from the air that you exhale, which is then breathed again. These systems are cheaper to purchase, but require the ongoing purchase of the chemical cartridges. These systems are only used for intermittent Exposure, not for sleeping.