Uv can also break down chemicals.That wasn't my point. He showed UV reduced the effectiveness of Vibrant, which implies UV is killing the active ingredient. Bacteria. If there is no bacteria in the bottle then the UV effect didn't exist or it was a result of an unidentified cause.
could also have killed things in the water that the algicide then binds to. Could slow the uptake of any releases phosphate by killing things in the water unrelated to vibrant.
I don’t know why ya all keep grasping for something that isn’t there. It has been undeniably established and even said by UWC (during one of they goal post shifts) that there is no living bacteria in the bottle.