AC,
The petroleum industry actually uses CaCl2 to dry their wet streams of gas, most probably because it is much cheaper and abundant than zeolite. It would be dead simple to rig up an inexpensive filter-drier.
I am intentionally leaving a lot out of my posts as to the many applications of this material. The phase change theory fit into the overall process for explanation's sake, but the omitted possibilities should provoke the imagination, to say the least.
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