Automatic water dispenser and water fountain: how to choose (and keep the water clean)
Many cats drink very little — and hydration also depends on the type of food (dry vs. wet food). The Cornell Feline Health Center explains that cats that eat wet food (which can be very watery) tend to drink less, and provides a reference for total daily water consumption.
1) Gravity-fed drinking fountain vs. circulating fountain
A) Gravity-fed drinking fountain (dispenser)
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Simple, inexpensive, large capacity.
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Good for dogs and for "not running out of water".
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But : the water becomes stagnant (less attractive to many cats).
B) Fountain with circulating water (with filter)
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Some cats prefer running water.
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This can help encourage you to drink more.
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Filtered fountains keep the water fresher and cleaner, provided there is maintenance.
2) Filters and maintenance (what to tell the customer)
A fountain is only "better" if it is well cared for.
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Wash the reservoir and parts (biofilm appears quickly).
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Replace/clean the filter according to the manufacturer's instructions.
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VCA recommends cleaning the filter weekly or as directed .
3) Correct capacity (Portugal: heat = more consumption)
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Cats: multiple water sources in the house help.
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Dogs: choose capacity based on size and whether the animal will be left alone for many hours.
4) Materials and noise
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Stainless steel/ceramic: less odor and easier cleaning.
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Plastic: cheaper, but requires more thorough cleaning.
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"Silent": important for bedrooms/living rooms and for sensitive cats.
FAQ
Is a water fountain worthwhile for cats? Often, yes: some cats prefer running water, and this can increase their water intake.
Does wet food replace water? It greatly helps with hydration, but fresh water should always be available.
How often should you clean it? Ideally, frequent cleaning + following the filter instructions; weekly filter cleaning is recommended for fountains.