Digital camera to use commonly CCD photographic, sunshine for it is not CCD wavelength is accepted, so the use ultraviolet filter is not obvious.

This would include in-line instrumentation, flow meters, regulating valves ultraviolet lights, pumps, pump seals, filter membranes, gasket and seal materials, and other specialized in-line devices.

Result the flora number in air before and after ultraviolet disinfection had statistical significance, while the flora number in the surface of air-condition's filter had no statistical significance.