This unit for the price should do the job it’s made to do. We have used this product in our small lounge room and have not noticed any improvement in our allergy problems or health. We still wake up with severe allergies. The light always shows we have clear air which has to be untrue we can spray in the same room and may change purple but within seconds will change back blue stating clear air which couldn’t be possible this quick. Also have to push hard to set and does not always stay on the settings we choose. We did call about our concerns but was told it’s working if it’s turned blue to purple even if that only lasts seconds. Not impressed with the unit at all it’s been like this since new and only purchased a few months ago