The filter is not required for normal operation of the fountain, but it does significantly improve the overall cleanliness and taste of the water for your pets. The filter removes bad tastes and odors to improve the taste of the water and catches hair and small particles to keep the water cleaner.
Filters are still helpful even if you use filtered water in the fountain. The activated carbon continuously cleans water as it flows through the filter. The pre-filter protects the pump from dirt, fur, drool, and debris.
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