It’s a UV-C light. There are many applications of UV-C, the most often seen in Our trades is for AC coils.It’s a U-tube addition in the plenum box that exposes the inside of the evaporator coil to UV-C light waves. They work great to prevent mold and Legionnaires disease.. But caution, they do cause eye damage to humans if you are exposed without the UV glasses. Primarily Cataracts.
I’m sorry, your referring to the liquid sodium Hypocrite type. Supplied in a normally 12.5 percent concentration and then cut depending on use. 10 PPM will kill most any virus or bacterial with just a 30 second exposure. But leaving it on longer is always preferred.
On a side of this, I was a assistant Captain in a volunteer Ambulance Corp during the Aid’s scare. We had to scramble to find a suitable sanitizer/disinfectant for our equipment like Back boards, Mash pants, and vacuum splints. We wound up with this same one from Spray nine right up the road from me. It’s amazing how many of the same product is marketed under other names for the same reason.