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|[[File:ExhaustedScrubberImmediate.JPG|none|thumb|500px|Immediately after use the CO2 scrubber had a much darker color.]]
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=Troubleshooting=
There are a few common problems you may encounter with this DIY system.
* If your [[SpO2|SpO<sub>2</sub>]] level does not drop and your breathing is relaxed and easy, you probably have a leak somewhere.
* If your [[SpO2|SpO<sub>2</sub>]] level does not drop, your breathing is strained and you feel like your lungs are burning, then your CO2 scrubber is not working. If the scrubber has turned purple, then it's exhausted, but if it's still white then maybe your [[DIY Hypoxicator]] is too small.
* If your CO2 scrubber seems to get exhausted quickly, check that you are filling it fully. See the image below for details.
[[File:PartialFillScrubber.JPG|none|thumb|500px|Here you can see the result of a slight air gap at the top of the scrubber. The air is choosing the path of least resistance, and flowing up and over the CO2 scrubber, resulting in poor CO2 removal and rapid depletion of the scrubber. The color of this picture has been enhanced so you can see the purple of the exhausted scrubber, and I've outlined the area. Note that there is only a slight air gap, but it's enough to make a difference.]]
=Iron Deficiency and Anemia=
If you are deficient in iron then it will be difficult for your body to adapt to altitude training. The best thing is to get your iron levels checked with a serum ferritin blood test. I have mine tested periodically at a local [http://www.walkinlab.com/ferritinserumtest.html Walk In Lab]. The cost is about $40, though they sometimes run offers.
=Feedback requested=
If you build one of these systems, I'd be grateful if you let me know how you get on. I'm also interested if you find any improved parts or other suggestions for improvements.