I'm quite fastidious and the boxes (I have two)and they get washed out once a week and new pellets put in at the same time. I'm honestly not sure what more I can do to keep my place smelling fresh.

On air purifiers: are there any good ones that are natural (as opposed to Fabreze and other crap that's not good for you)? I've tried the natural orange/citrus air freshener, and others labeled as "air neutralizer"s but they never really do the trick.

I'm trying an odor absorber - one with charcoal bits in it and I'm hoping it works, but alas, I live in it so I can't tell if it's working or not.