Someone, when we first got our ferrets this Spring, suggested an airfilter to control odor. (what odor? I *like* the way our ferrets smell!) At the time, one of our ferrets, Eris was having a tough time with allergies. So the addition of the airfilter not only controlled odor but helped to eliminate the Oak pollen that she seemed to react to. Anyway, Maggie Sez: >And yes folks, it does make a difference. I do have one that has an >ionizer but be aware you shouldn't run those too much. They can create >ozone if you do. Actually its not the creation of Ozone that is a problem with airfilters that have a de-ionizer option. I know a bit about generating excessive amounts of ozone as my other hobby is fishkeeping and ozone is used sometimes in marine aquaria to fix organic matter for removal by protein skimming or to control redox potential. Too much ozone there does exciting thing to your nitrates and also smells really awful. Anyway, the problem with aircleaners with a de-ionizer option is that they "charge" large airborne particles so these particles settle and not float around for the dust sensitive to inhale. This is great unless you run around with your nose 3" from the floor kicking up all those particles and inhaling them. We all know our little buddies are fairly sensitive to respritory irritiation so this is why a airfilter with a de-ionizing option may not be a good thing for ferrets but great for us! Also, airfilter users. Go change your carbon filter. Do it today before you forget!!! And your smoke alarm batteries while you are at it!! Ann [Posted in FML issue 2087]