The jury is out on this product.The have a bio filter you can use to add some moisture to your air. Maybe you can save some cash if you don't need Nitrox:
Apollo Sports: Dive Gear: Regulators: Bio-Filter
Sean
There are some health concerns (what grows well in warm, dark, moist environments and wouldn't be good to inhale?) with it unless you maintain it perfectly.
Just a heads up...