Petkit's fountain and camera combo treats your pet like royalty. CNET
Capacity
A pet water fountain doesn’t have to be huge, but larger models tend to be easier to maintain, staying full and clean for longer periods of time. Look for fountains that can hold around two liters of water if possible.
Noise
You’d be surprised how much a small trickle of water in the room can get on your nerves, especially if you’ve never had an indoor fountain before. It tends to sound like a toilet that won’t shut off or a faucet that was left on. It’s a good idea to glance at reviews or testing to see if anyone is complaining about the noise. The best fountains offer smooth, flowing water that doesn’t have much, if any, sound.
Filtration and filter cost
These fountains all have some type of filtration that you’ll need to replace every few weeks to few months, depending on the design. If you’re worried about costs, take a look at filter packs and make sure they are in your budget. You really don’t want to skip on filters for drinking water. Most tend to cost around $10 or so for a pack that can last six months to a year.
Filters and fountains tend to last much longer if you use filtered water or softened water in the tank, although this may also cost extra.
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Portable vs. plug-in
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