Nothing better than Carbon filter I believe, and it is green for everybody.
ONA works more as a masking agent rather than neutralizing I guess because I got some Bubbleberry from Sagarmatha Seeds and the smell was crazy, uncontrollable wihtout carbon filter, plus it is way cheaper to run.
And to finish, from a friend point of view:
There must be some bad chemicals in it cz my cat has a very bad skin and respiratory condition (really

), it reacts to any perfumes, cream, soap you might have on you. Even with food we have to be careful.
Although, knowing his condition, once I used that ONA stuff, his condition got immediately really bad, I knew it was that because the effect was so brutal /sudden... stopped but only after 2 weeks, he got better.
Not that it proves anything but to me it is just enough, taking care not to smoke fertilizer etc... I do not want to throw "chemics" in the air where I live!