Product review (3 stars): Venta Sonic Cartridges So-So
I think that the Venta Sonic humidifier works really well but the cartridges get a white dusty film all over everything in the room, even my shoes.  During the winter, I'm constantly cleaning the dust and if it's there, I may be breathing it.  I'm not going to use distilled water as I fill two tanks every night.  I believe that without using the cartridge, the dust is worse.