The Drinkwell Hy-Drate filter/fountain seems like a good idea, but isn't one that I or my cats are overly impressed with. I have both a young and old cat, and they really don't seem to care one way or the other about it. A few weeks of use and their drinking habits remained unchanged. They noticed the filter when I placed in their bowl the first time, but after some initial wariness they just ignore the moving water.
The cord for the filter is a decent length, but having a wall outlet near your usual feeding spot is a good idea. The fountain is a little larger than an egg and is almost too big for my good-sized water bowl. I have to make sure to top off the water daily so that the level does not get too low which could lead to the filter motor burning out. So I recommend using the Hy-drate in an oversized bowl/dish. There is a secondary suction cup on the cord to help keep it out of the way, but it will not stick to my porously painted wall. I'm not a fan of drawing outlet power for something if I don't really need to, so letting this run day and night doesn't sit well with me. My cat's indifference to the filter/fountain makes plugging and unplugging it during meal times unnecessary as well.
I will admit that the Hy-Drate is very quiet and affixes securely in the dish. The white finish blends well with the enamel bowl so it isn't overly visible but for the movement of the water. The filtering action may be handy to some as well, but most of the time I refill my cat's water bowl using filtered water anyway. Upon reflection, I can't really justify the cost of the Hy-Drate (factoring in electricity and replacement filters). If it turns out your cat loves moving water and the filtering feature is important to you, then perhaps Drinkwell's Hy-Drate might fit your needs.
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