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* Replacement cartridges $100 each, $300 for four
===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 CO2 scrubber which has to be replaced and lasts 2-3 hours. The running costs would be $10-15 per hour. http://www.altolab-usa.com/
* The elite kit is $850 and contains 8 AltoMixers giving 5,000-40,000 ft of elevation, 12 silos (CO2 scrubbers) proving 24 hours of usage, a pulse oximeter and the masks.
* Replacement silos (CO2 scrubbers) are $30
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