Silica gel can be rejuvinated (dried) by baking in an oven at the prescribed time and temperature. This can either be done at intervals set by the user or when the humidity in the container gets too high. How high is too high? Your call on that one. But how do you tell what the humidity level is? Cheapest way is probably to put a humidity indicator tag/strip in the container - like these: http://www.ebay.com/sch/i.html?_ftrt...fLoc=1&_sop=15
When you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind. [Lord Kelvin]
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