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<html><iframe width="425" height="349" src="http{{#evp://www.youtube.com/embed/|6uK1Ua8ENGU" frameborder="0" allowfullscreen></iframe></html>|How to open the AltoLab silos|none}}
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* The absorbent material (soda lime) has a color change that indicates when it is exhausted. However, the color change is only present immediately after use. If you leave the scrubber for a few hours, it will return to its original color, even though it is still expired.
* I created a video of opening the silo for scrubber replacement at http://youtu.be/6uK1Ua8ENGU
==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 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.