A little history on Kitty Liter. The first people who figured out it works and started pushing the concept were laughed at severely from guys & gals who "knew" these guys were crackpots. Over time, peoples minds were changed one person with an open mind at a time until no one (or not many) is laughing at using Kitty Littler any longer. I had the pleasure of having dinner with one of the innovators of using Kitty Litter just over a decade ago. I asked him point blank "how does it work?" He said it is the simplest thing you could ever think of. He told me to "train" Kitty Litter, you simply put it in an ice chest with a Cigar Oasis that is set to what ever % you want to have...be it 65% or 70% or anything else...and close the lid for a couple weeks. When that fan quits coming on you know you are at your desired humidity level and you are good to go.