Originally Posted By: BlueFire
...Should I be worried? grin

Apparently not. From what I've googled, I understand that UV treatment applies specific wavelengths to target the DNA of micro-organisms, rendering them incapable of reproduction. There's no chemical change in the irradiated liquid. It doesn't require high intensity, and such devices have been in use by aquarists for many decades, as a non-polluting 24/7 means of protecting their fish from pathogens.

"Time is what prevents everything from happening at once" - John Wheeler