Impulsing off topic: It looks like they do work, just nowhere near the efficiency of a HEPA filter. Ionic filters certainly work in principle, but they really c

Impulsing off topic: It looks like they do work, just nowhere near the efficiency of a HEPA filter. Ionic filters certainly work in principle, but they really can't compete with devices with higher surface area (any fibrous air filter) or higher power (a CRT screen). Or the humongous surface area of the furniture of the room. Funnily, in the little clean room lab I worked in at college, we would occasionally run the vacuum cleaners for a few days because they had great HEPA filters, spot improving sensitive zones. Kinda noisy for home use, though.