Not all but most incorporate some ionizing feature. I even have a carbon filter one which claims that the carbon itself has ionizing properties and therefor they claim its an ionizing filter but I doubt its that ionizing. I found that you can get the best deal for these on eBay. There are plenty on there and I recommend the Sharper Image models they seem to have the best systems Best bang for the buck!
Not all but most incorporate some ionizing feature. I even have a carbon filter one which claims that the carbon itself has ionizing properties and therefor they claim its an ionizing filter but I doubt its that ionizing. I found that you can get the best deal for these on eBay. There are plenty on there and I recommend the Sharper Image models they seem to have the best systems Best bang for the buck!