I've been using BlueAir (have the original one that looks like a tank) for 20 year and it has been fantastic. I live in NYC, so the air can get dirty and the Bl

I've been using BlueAir (have the original one that looks like a tank) for 20 year and it has been fantastic. I live in NYC, so the air can get dirty and the BlueAir def makes a difference. And I've never even had to change the filter in 20 years! It is that good! Kidding - change it about every 6 months.