Hay @suethenanny, The UV light is near where water comes into the home. So it kills virus and bacteria that is in the water coming from outside, but if the NTM is in the biofilm in the pipes it can still pick it up along the way to the faucet. I DO have a UV light, but also boil or use Lifestraw to get the rest out. Hope that helps!

I don’t know.
Still investigating.