by the way - don't go fancy on expensive UV equipment. It's a temporary tool at best and they all do about the same thing. I broke my expensive UV and just got a cheap Jebao 55 and it's fine.
https://www.amazon.com/Jebao-CW-55-C.../dp/B00K1HHG9U
I know this looks massive on a 29, but you want a lot of power and real low flow. this isn't a fast fix... it's mutliple days of blasting them a little at a time.