Just though I'd let everyone know that you can often buy silica gel cheap near the cat litter of the big box stores. It's sold as an odour reducer for cat litter. I just bought a 2 lb. bag for $8. Says "Dust free, non-toxic" on the bag, and has the blue indidcator crystals in it. I'm gonna use small double-lock freezer bags and poke a bunch of holes in them with a pin and toss them into my 5 gal buckets. This way I can take the crystals out of the bag and bake them on a cookie sheet when they need it.