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| align="center" style="background:#f0f0f0;"|'''Cons'''
|-
| Semi-permeable membrane (SPM) <ref name="semi"/>. ||Separate N2 and O<SUB>2</SUB> using a 'sieve' ||[[Intermittent Hypoxic Exposure ]] at rest or while exercising||GO<SUB>2</SUB>Altitude||Minimal running costs, Stable 02 levels||Expensive to buy, Lower flow rates than PSAS
|-
| Pressure swing absorption<ref name="psa"/> ||Different gases are absorbed at different rates under different pressures ||Live High, Train Low, Altitude tents or altitude rooms||CAT, Hypoxico, and Higher Peak (same generator, different prices)||Minimal running costs, High flow rates at moderate O<SUB>2</SUB> concentrations||Expensive to buy, Poor performance at low O<SUB>2</SUB> concentrations
|-
| Rebreather||Use of scrubber to absorb exhaled CO<SUB>2</SUB>, which then contains less O<SUB>2</SUB> and is rebreathed||[[Intermittent Hypoxic Exposure ]] at rest ||AltO<sub>2</sub>lab, AlitPower||Cheap to buy, Cheap to run (refilling cartridges)||Harder to control O<SUB>2</SUB> concentrations
|}
==Recommendations==
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.
===AltoLab===
[[AltoLab]] uses a stack of AltoMixers, with each AltoMixer diluting the oxygen to provide the equivalent of 5,000 ft. The [[AltoLab ]] system also requires a CO<SUB>2</SUB> scrubber which has to be replaced and lasts 2-3 hours. The running costs would be $10-15 per hour, but you can buy the CO<SUB>2</SUB> scrubber in bulk, reducing the cost down to $1 per hour; see [[AltoLab]] for details. http://www.altolab-usa.com/
* The elite kit is $850 and contains 8 AltoMixers giving 5,000-40,000 ft of elevation, 12 silos (CO<SUB>2</SUB> scrubbers) proving 24 hours of usage, a [[Pulse Oximeter]] and the masks.
* The performance kit is $580 and contains 6 AltoMixers giving 5,000-30,000 ft of elevation, 6 silos (CO<SUB>2</SUB> scrubbers) proving 12 hours of usage, a [[Pulse Oximeter]] and the masks.
* 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 [[Pulse Oximeter]]
* Replacement cartridges $100 each, $300 for four
These products look physically identical to the Higher Peak products.
===Colorado Altitude Training===
Colorado [[Altitude Training ]] provide a wide variety of systems, but do not publish prices.
==Semi-Permeable Membrane==
===GO2Altitude===
