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Silica gel absorbs water until it is saturated and no more can be absorbed.
It can then be regenerated by heating to drive off the absorbed water many many times. But this is hit or miss with with uncoloured silica gel. You need self-indicating silica gel. This is blue when ready to absorb water vapour and turns red when expired, ready to be heated to 70 degrees C or up to 100 degrees or for about 5 minutes in a microwave, when it will again turn blue and be ready to absorb more water.
The uncoloured stuff in the little bags will have long ago been saturated, unless kept in an airtight enclosure after it was last heated and dried out.
And the trouble is you cannot tell when it is dry and when it is saturated and not doing any good.
I think it will be a waste of time using stuff that has already been exposed unless you regenerate it. And then you won't know when it has saturated and needs re heating.
You can buy the self-indicating stuff from a lab supplies stores and pakaging specialists.
Silica gel is not kitty litter in my ccountry. Here it is absorbant clay, perlite, pumice or other absorbant minerals.
SAJ in NZ