@ K2k6
It would work okay with milk- you'd just have to have a long, wide channel running very shallow and fast under a series of UV tubes. You'd just need to determine the optimal depth of the channel by measuring the UV transmitted through it- from that you could assume a channel width, then using the minimum exposure time and the optimal depth you could calculate a flow rate that would match those criteria.

In our case it's a three-foot square box of tubes that stand in a six foot deep channel of dirty water that flows past. What we're improving is the mechanism that cleans the tubes by means if a wiper system. At this point it's not well designed, and they know it- so they brought us mechanical types in. Booya.
( The Resident Loon Not a demographic. Do not measure., Thu 10 Jul 2008, 21:31, Reply)