I went to the Pet store today, and found a filterized cat water bowl! Do you think that would be good for the cats? The water is always on a cycle. It goin in to the bowl and is instantely sucked up in the filter again. More water is always been filtered and poured in the bowl. I though maybe that would avoid germs?! Has anyone used or seen one of these? Do they worked or are they just an over priced water bowl!?