To clean a pet water fountain, unplug it, take it apart, wash the bowl and reservoir with mild soap, scrub the pump and impeller with a small brush, replace the filter on schedule and prime the pump before you plug it back in. The steps below cover each part, plus fixes for a noisy pump.

Why Cleaning Your Pet Water Fountain Matters

A pet water fountain encourages your cat or dog to drink more, but it only works well if you keep it clean. Over time, slime, pink biofilm, and mineral deposits build up inside the reservoir, pump, and tubing. A dirty fountain can develop a bad taste, grow bacteria, and make the pump run loudly or stop working. This guide walks you through the full cleaning routine, from spotting the signs to reassembling a quiet, fresh fountain.

How Often to Clean Your Fountain

Many manufacturers recommend a full disassembly and deep clean every week or two. If you have multiple pets, hard water, or a fountain that sits in a warm spot, you may need to clean it more often. A good rule of thumb is to check the water daily and do a quick rinse and refill every few days. When you see visible slime, pink or orange biofilm, or notice the pump making unusual sounds, it is time for a thorough cleaning. Never let the fountain run dry, as that can damage the pump and encourage buildup.

Unplug and Take It Apart

Before you touch the fountain, unplug it from the electrical outlet. Never submerge the power cord or plug. Remove the water bowl or top tray, then lift out the reservoir. Take out the pump and any tubing or attachments. Set aside the filter (if it is replaceable) and any charcoal or foam pads. Check your fountain’s manual for specific disassembly steps, because some models have multiple chambers or non-removable parts. Lay all pieces on a clean towel so you can see what needs scrubbing.

Cleaning the Reservoir and Bowl

Wash the reservoir, bowl, and any removable plastic or ceramic parts with warm water and a mild dish soap. Use a soft sponge or cloth; avoid abrasive scrubbers that can scratch surfaces, because scratches create hiding spots for bacteria. Rinse every piece thoroughly until no soap residue remains. For stubborn mineral deposits or biofilm, soak the parts in a solution of white vinegar and water (roughly one part vinegar to three parts water) for 15 to 30 minutes, then scrub gently. After soaking, rinse very well with clean water. Never use bleach, ammonia, or harsh chemical cleaners, as they can leave toxic residues and damage the fountain materials. If your manual says parts are dishwasher safe, place them on the top rack of the dishwasher using a gentle cycle and no heated dry. Always confirm with the manual first.

Cleaning the Pump

The pump is the most important part to clean thoroughly. A dirty pump is the most common cause of noise and reduced water flow. First, disconnect the pump from the power cord (if it is detachable) and remove it from the fountain. Take apart the pump housing according to the manual; many pumps have a small cover that lifts off to reveal the impeller and magnet. Use a small brush, such as a dedicated pump cleaning brush or a soft toothbrush, to gently scrub the impeller, the magnet, and the inside of the pump chamber. Pay special attention to the small inlet holes where debris gets trapped. A small cleaning brush kit can reach tight spots. Rinse the pump parts under running water. Do not use soap inside the pump chamber, as soap residue can affect performance. If the impeller does not spin freely after cleaning, check for lodged debris or mineral buildup. Reassemble the pump and set it aside.

Filters

Most pet water fountains use a replaceable filter that contains activated charcoal and a foam pre-filter. The filter should be replaced according to the manufacturer’s schedule, typically every two to four weeks, but always follow the manual. A clogged or old filter reduces water flow and can make the pump work harder, leading to noise. When you deep clean the fountain, remove the filter and discard it if it is due for replacement. Rinse a new filter under cool water for about 15 seconds before placing it in the fountain. Some fountains also have a separate foam pad that can be rinsed and reused several times before needing replacement. Keep a supply of replacement filters on hand so you never run out. Never try to wash and reuse a charcoal filter that has expired, as it loses its ability to remove impurities.

Reassembly and Priming

After all parts are clean and dry, reassemble the fountain in reverse order of disassembly. Place the pump back into its compartment, attach tubing, and insert the filter. Fill the reservoir with fresh, cool water. Plug the fountain in and turn it on. The pump may need a few seconds to prime, especially if it ran dry during cleaning. If water does not start flowing immediately, pour a small amount of water directly into the pump chamber to help it prime. Check for leaks around seals and connections. Listen for unusual sounds; a properly cleaned and assembled fountain should run quietly.

Noisy Pump Troubleshooting

If your fountain is making noise after cleaning, the most likely cause is the pump. Here are common issues and what to check:

  • Air trapped in the pump. After reassembly, air bubbles can cause rattling or gurgling. Let the pump run for a few minutes; air often works itself out. You can also tilt the fountain slightly or pour water directly into the pump inlet to displace air.
  • Impeller not seated correctly. Remove the pump and open the housing. Make sure the impeller and magnet are properly aligned and spin freely. A small piece of debris can still be lodged there.
  • Low water level. If the water level is too low, the pump will suck air and make noise. Top off the reservoir to the recommended fill line.
  • Mineral buildup inside the pump. Even after a vinegar soak, hard water deposits can remain. Try soaking the pump parts in a stronger vinegar solution (equal parts vinegar and water) for up to an hour, then scrub again.
  • Worn pump. If the pump is old or has been run dry repeatedly, it may need replacement. Check the fountain manual for compatible pump models.
  • Filter clogged. A dirty filter restricts flow and forces the pump to work harder, causing noise. Replace the filter if it is due.

If none of these steps quiet the pump, consult the fountain manufacturer’s troubleshooting guide or contact their support.

FAQ

How do I know when my pet water fountain needs cleaning?

Look for visible slime, pink or orange biofilm, floating debris, or a change in water clarity. If the pump becomes noisy or water flow slows down, it is time for a deep clean. A quick smell test can also tell you; clean water should have no odor.

Can I put the fountain parts in the dishwasher?

Only if the manufacturer’s manual says they are dishwasher safe. Many plastic and ceramic parts can go on the top rack of the dishwasher, but pumps and electrical components should never go in the dishwasher. Always check the manual first.

What should I do if my fountain pump is still noisy after cleaning?

Recheck the impeller for debris, make sure the water level is high enough, and confirm the filter is not clogged. If the noise persists, the pump may be worn or damaged and might need replacement.

How often should I replace the filter?

Follow the manufacturer’s recommendation, typically every two to four weeks. If you notice reduced water flow or the water starts to smell, replace the filter sooner.

Keeping Your Fountain Running Smoothly

A clean pet water fountain encourages your cat or dog to stay hydrated. By sticking to a regular cleaning routine—daily rinses and weekly deep cleans—you prevent buildup, reduce noise, and extend the life of the pump. For more details on choosing and setting up a fountain, see our pet water fountain guide. And when it is time to replace the filter or find cleaning supplies, browse fountain filters and cleaning accessories for the right parts. A little maintenance goes a long way toward fresh, appealing water for your pet.