The UV-C equipment has been earlier described (Artes-
Hernandez et al., 2009). Briefly, the treatment chamber consisted
of a reflective stainless steel chamber with two banks (one bank
suspended horizontally over the radiation vessel and the other
placed below it) being fitted to each bank 15 unfiltered germicidal
emitting lamps (TUV 36W/G36 T8, Philips, Eindhoven, The
Netherlands)