I dont have one now but I did for ten yrs. I had mine in my return line but that really was too much to be effective. If it was me I would just get a small pump and run it through the UV. Check out Coral life turbo twist as it has a circular path that allows more kill time. I`m interested to know why you think you need one?
I dont think I absolutely need one but Iam investing a lot of money into this project (130gal reef build, basement sump) and if a UV sterilizer will help keep my aquarium disease free(hopefuly), I think it will be worth it.