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* The absorbent material (soda lime) has a color change that indicates when it is exhausted. After the scrubber had become ineffective, the color change had not occurred. This suggests that there is more life left in the absorbent material, but there is not enough material for it to work effectively. Using two scrubbers together may get more life out of the material.
==Running Costs==
Each CO<SUB>2</SUB> scrubber costs $22, or $18 when you by 6 at a time. This works out as a running cost of nearly $10 per hour, which can get a little pricey. I have found that the scrubbers open up quite easily, and can be refilled with a bulk CO<SUB>2</SUB> scrubber. I used [[http://www.shopmedvet.com/product/3057 SodaSorb] JorVet soda lime (see above) which is $10 for 3 pounds. Each CO<SUB>2</SUB> scrubber holds about half a pound, and lasts for 3-4 sessions, rather than 2-3 for the original. This reduces the running cost less than $1 per hour.
==See Also==
* [[Altitude Training]]