Dangerous, expensive, useless.

Honestly - I understand the mass of good Rezenssionen here in any way.
Apart from that the Drinkwell Fountain is so created by the design that the filter per se "passed over" are (too much water, for example in the filter tank), I can not detect any filter function.
My dog ​​had the fountains are quite a while next to his food dish. He ate his food, he drank then logical manner and let go and to smaller pieces in the pool while back. Now one would think that this was not a problem, after all, has this system yes Filter. But Nope - the remains were in the pool return (pump too weak), which rapidly formed a greasy film on the water. Now passed through the water filter, then it ran back into the dirty water and ungefiltere back. Somut result - zero. And to top it off, all kinds of particles make these filters by inserting himself first into the water, which is certainly not the point of it.
On closer examination of the basic idea of ​​this activated carbon filter and the effect of which, you will soon come out that this can hardly be healthy already per se and is superfluous. Coal keeps germs (in tap water scarce and completely harmless) only, but does not kill them off. Thus, these quickly accumulate and break at some point "by" if the filter is not replaced in time. At least then you have really unhealthy water - and who knows when that can happen / is? Add to that the really dangerous pathogens (eg. Legionella) are not stopped by this coal. So why bother?

In my mind, a completely useless function and pure moneymaking. Dog and cat, it is enough if the water does not "projects" and is always enriched by the splashing with oxygen. Whether there is now intervening depends an expensive carbon filter which owned no deeper meaning and charged only the purse, is both the dog, as also the hangover matter. Cleans not every day the water basin of the fountain, a fact also brings the best filter anything. Of course, selling something these days well, everyone just wants the best for his pet. Thus included in this figure probably also the producers who continue to deserve so long on each sold well money. This is - you sometimes dealt with the issue - a daily exchange / change the water bowl still the best and healthiest way for a germ-free water source. And who be animal with tap water, instead supplied with groundwater from a well, must anyway still no fear germs. The animals to get elsewhere, but certainly not on constantly controlled drinking. For this purpose a regular exchange of the cup, then it need no expensive filter systems whose effect is controversial and even give off substances.