There are two massive problems with the built in UV
- the power of the bulb and the flow rate of the filter; the two are inversely related. You can have a weak bulb, like that which is in the filter, and a long exposure time and have it be effective. Green killing machine is a good example of this. Or you can have a powerful bulb with a shorter exposure time be effective. What's not effective is a low powered bulb with a low exposure time, which is what you get with the built in units.
If it's the B models that have the UV
, then it's the A models that do not.
If you want to run UV
, then I would highly recommend getting an actual UV
unit. The fact that the plain UV
units cost more than the filters with the built in UVs should speak volumes about their quality.