Looks like Kevin pretty well covered the UV part of your question.

About the ozone machines. Check out http://www.ozonicshunting.com/. A buddy of mine shoots for Wild Outdoors and I was told that all of Jay's shooters has one of these in the tree with them. While I have never used one, my buddy has told me they work great. However, these are pretty expensive toys and I cannot imagine me owning one until the price drops into the poor man's range.