Quoted:
I find it curious that anyone would advocate paying for something that can be had for free but to each his own.
If you have ready availability of large bags of silica gel, then by all means pick them up, if you're willing to spend the time to reactivate them from an unknown state.
The crystal cat litter (100% silica gel) is so cheap that it's hardly worth putting in the time or effort to scrounge around for free silica gel that you then have to reactivate. "Go find a Japanese motorcycle dealership and look in their dumpster for desiccant packages" is not an effective or efficient acquisition strategy for the vast majority of people, when the equivalent product is available new/fresh for a few dollars at wal mart or a grocery store.
Quoted:
A product designed for a specific function, serving in that function is a REAL product to me. Cat litter may serve the save purpose, it may be essentially the same thing- or it may not there is a wide variance in products and most of us are not chemical engineers, the German word Ersatz comes to mind.
Good grief
Simple chemical substances have a variety of uses. Silica gel absorbs a radical amount of moisture/water; it will soak up that water from the air in a motorcycle crate, an ammo box, or will soak up your cat pee just as efficiently, which is why the exact same chemical is used for all those purposes.
Being that this is the survival forum, I would think it would be an imperative to learn about the versatility of things like this.
By the way... wonder what other chemicals/gasses that used silica gel may have sucked up, which will be released when you reactivate it in your oven?