I treat mine for mites when I get it. What I do is empty the bag out in chunks and spray it down, add more, and treat, repeat...Also like the above post said make sure its not treated with anything and your good to go. I personally love the stuff. I think it looks better then aspen and is better at holding humidity. Aspen makes my snake room look like I have a bunch of hampsters or some kind of rodent running around and I don't like that lol. Aspen does work good too, thats what I used prior, but cypress is cheaper in bulk and better looking so I changed. Good Luck!
PS I get mine at home depot and lowes for like 3.50-5.00 a bag. Stuff is cheap, YAY!!