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* '''CO2 Scrubber'''. As detailed in the [[DIY Hypoxicator]] instructions, the CO2 scrubber is a consumable, so buy enough to last you for a few weeks. I typically buy 3-5 bags at a time.
* '''Pulse Oximeter'''. To monitor and control your altitude training, and to keep you safe, you need to measure your [[SpO2|SpO<sub>2</sub>]] with a [[Pulse Oximeter]]. You can get a good one for about $35, or one with a PC interface for recording and analysis with the [[Hypoxic Timer]] software for $85.
* '''Viral/bacterial filters'''. These will keep your lungs clean and should be replaced periodically. I have 2-3 open that I cycle through to make sure they have plenty of time to dry out between uses. They cost around $3 each; [http://www.allegromedical.com/respiratory-therapy-c534/main-flow-bacterial-viral-filter-p547468.html?utm_expida_aid=44248-8 98b31cc5 Main Flow Bacterial/Viral Filter at Allegro Medical] or [http://www.allegromedical.com/wound-care-c541/breathing-filter-p548489.html ?a_aid=98b31cc5 Breathing Filter].* '''Hose'''. The hose I use is cheap, though you have to buy it in 100 foot (30m) lengths for $15. [http://www.allegromedical.com/respiratory-therapy-c534/corr-a-flex-ii-roll-tubing-p174363.html ?a_aid=98b31cc5 CORR-A-FLEX II Roll Tubing at Allegro Medical]. * '''Mouthpiece'''. I've not been able to find another supplier of the mouthpiece I use, but this [http://www.allegromedical.com/respiratory-therapy-c534/angled-mouthpiece-for-mabis-nebulizers-p561316.html ?a_aid=98b31cc5 Angled Mouthpiece for MABIS Nebulizers] works and it is only $3. (You'll need to tape the hole at the bend.) I recommend against using a facemask, and it's '''vital you don't attach the mouthpiece to your head'''. If your SpO2 drops too low you might pass out, in which case you need the mouthpiece to fall out so you'll start breathing normal air and recover. * '''Tee adapter'''. To branch the hose I use a Tee adapter taken from this [http://www.allegromedical.com/respiratory-therapy-c534/aerosol-drainage-bags-p547470.html ?a_aid=98b31cc5 Drainage Bag] as it was only $2. * '''Adapters'''. It's handy to have some adapters like this [http://www.allegromedical.com/respiratory-therapy-c534/multi-adaptor-p547466.html ?a_aid=98b31cc5 multi adapt] to connect hoses together or change a male to female end, and they are only a dollar or so.
* '''Ball valve'''. I got a plastic plumbing ball valve from a local DIY store. It's far from ideal as it is too tight to turn, but it only cost a couple of dollars.
* '''Bag'''. I use a cheap 2.5 gallon Ziploc bag for the rebreathing. I cut a small hole in the end and attach it either directly to the hypoxicator with a cable tie or to half of a viral filter so I can remove it easily.