I bought my first Salin® Plus Air Purifier  in January 2017. I read that salt therapy was very effective for respiratory ailments. I hoped that it might help my Son, Adam,  with his asthma. Usually during February and on into spring the asthma would start to flare up causing wheezing, coughing and lack of sleep. This inevitably led to a full chest infection. More medication and missed school followed. This however did not happen in 2017. This was the first spring in ten years that Adam stayed healthy and he is still doing well. The purifier is turned on every night in his bedroom. He is sleeping well with no tickly cough. He has an abundance of energy and is now on reduced medication for his asthma. I can only conclude that the Salin® Plus Air Purifier has helped Adam to stay healthy. I would have no hesitation in recommending this system as it has worked very well for us. I have just ordered a second purifier for my daughter who has sinusitis. I hope that it will be as successful for her.