She has had hers for about a decade now and has just replaced the silver wires when needed. I'm not sure the manufacturer of hers but there are a few more well known like LifeForce and Silvelungs that sell on Amazon and through their sites. The important part is finding one that does the right ppm for you and smaller molecule size. Most are 5ppm but there are ones that will go up to 40ppm, the higher concentrations require longer run times.