We did and I was surprised at the difference. I check the levels frequently, but am not sure how accurate the readings are. I can only go by what we are living in and as we are both 80 and vibrant and normal I am praying that what we are doing is keeping us "NORMAL" - Yes we tested our levels before and after and they show that indoors we are below what they consider "bad". As for the vibrations, I must include that they have kept both of us active and very cognizant. Please, look into the vibration therapy for people, especially those in the older years. They have cured many of our issues in the past few years. If you want more information let me know.