These ozone generators i personally wouldn't use them, i seem to remember hearing one of my high lvl biology or was it chemistry proffessors saying ozone, while some is good for the envioronment as a whole it can cause cancer and all sorts of nastys. i just made a carbon filter following the instructions in the diy section and it was cheap and to easy. order 12 lb of carbon off ebay for i think 20$ shipped and the parts was prolly about that mayb 30, plus you'll need a fan and that will add a bit unless you scrounge an old computer fan like i did.
hopefully 12 lbs of carbon will last awhile, i can't see my 6 in filter using more then 1 lbs we'll see when i get it though.