I have 2 Ionic pro knock offs from walmart. They are great at getting rid of the odors. My wife insists on keeping the puppy in our room and if we take the grid out to clean it and dont put it in right away by the 2nd day the room smells of puppy and piss (puppy piss not mine).
And when we clean the grid it is naaaaaaaaaasty. It looks like it is growing something on the blades. Black and fuzzy. Only thing about them I dislike is once they start to get dirty and you dont clean it right away it makes this awful static crackling sounds. Gets worse as days go by with out cleaning it so make sure once you start hearing the static noise to clean it right away. At night with it all quiet in the room it sounds like a mad scientist lab with all the pops,zaps, and crackles.