How Often to Clean a Cat Water Fountain (and How To Do It)
PETME2 TeamQuick answer: Clean your cat water fountain about once a week, and top it up with fresh water every day or two. Clean it more often (every 3 to 5 days) if you have several pets, a warm room, or see slime or hair. Replace the filter every 2 to 4 weeks. A full clean takes about 10 to 15 minutes.
By the PETME2 Team · Updated October 2026 · General information, not veterinary advice
Quick summary
- Daily or every other day: top up with fresh water and check the water level.
- Weekly: empty, wash the bowl, cover, and filter housing; rinse the pump.
- Every 2 to 4 weeks: replace the filter (or as the maker suggests).
- Monthly: take the pump apart and clean the small impeller.
- Use: warm water, mild unscented dish soap, and a small brush. Rinse well.
How often should you clean a cat water fountain?
Most fountain makers suggest a full clean about once a week. That is a good baseline for one cat in a normal home. Several things can mean you need to clean more often:
- More pets. Two or three cats (or a cat and a dog) means more drinking, more hair, and more food bits in the water.
- Warm weather. Water evaporates faster and residue builds up faster in a warm room.
- Hard water. White mineral spots on the pump and bowl are a sign to descale more often.
- Location. A fountain near the food bowl or litter box tends to collect more debris.
A simple rule: if the water looks cloudy, the surface feels slimy, or you can see hair in the bowl, it is time to clean, whatever the calendar says.
How the number of cats changes the schedule
One clean a week is a starting point, not a fixed rule. Use this table to find a rhythm that fits your home:
| Your home | Full clean | Water |
|---|---|---|
| One short-haired cat, cool room | About once a week | Top up every 1 to 2 days; replace it all at the weekly clean |
| One long-haired cat | Every 5 to 7 days | Top up daily |
| Two or three cats, or a cat and a dog | Every 3 to 5 days | Top up daily; replace it all at each clean |
| Hot weather or very hard tap water | Every 3 to 5 days | Top up daily and watch for white spots |
Watch the water, not just the calendar. Foam or bubbles that stay on the surface, a thin film, or hair floating in the bowl all mean it is time to clean, even if your usual day is still a few days away.
Daily: top up and check
Fountains lose water to drinking and evaporation. Topping up every day or two keeps the pump covered and the water fresh. Many fountains have a low-water reminder to help. For example, the PETME2 Classic 2L fountain has a low-water light and anti-dry pump protection, and the 2.2L fountain with stainless steel tray also has a low-water light. If you can see the water level through the tank, like on the Transparent 2.2L fountain, a quick glance is enough.
What do you need to clean a cat water fountain?
You only need a few simple things: warm water, mild unscented dish soap, a soft sponge, a small brush, and a cotton swab for the pump.
- Warm water
- Mild, unscented dish soap
- A soft sponge or cloth
- A small bottle brush or old toothbrush
- A cotton swab or pipe cleaner for the pump and tubes
- White vinegar (optional, for mineral buildup)
Avoid bleach, strong cleaners, and scented soaps. Cats have a strong sense of smell, and leftover scent can put them off drinking from the fountain.
How do you clean a cat water fountain, step by step?
Unplug it, empty it, take it apart, wash the bowl and cover in warm soapy water, clean the pump, rinse or replace the filter, then rinse everything, rebuild and refill. Here is each step in detail.
1. Unplug it first
Always unplug the fountain before you touch the water or the pump. Safety first.
2. Empty the water and take it apart
Pour out the old water. Remove the top cover, the filter, and the pump. Most fountains come apart by hand without tools. Keep the small parts together so nothing gets lost.
3. Wash the bowl and cover
Wash the bowl and cover with warm, soapy water. Use the brush for corners and the spout where slime likes to hide. Some fountain parts are dishwasher safe (top rack), but check your manual first. Stainless steel parts, like the bowl on the PETME2 3.2L stainless steel fountain, are usually the easiest to scrub clean.
4. Clean the pump
The pump is the part most people forget. Hair and residue can build up inside it and make it louder or weaker over time.
- Open the pump cover (it usually twists or pops off).
- Gently remove the small impeller (the little spinning part).
- Rinse it and use a cotton swab or small brush to clean inside the pump housing.
- Put it back together and make sure it spins freely.
Doing this about once a month (or every week in multi-pet homes) helps keep the pump quiet and the flow steady.
5. Check or replace the filter
Rinse the filter under clean water (no soap) if it is still in its replacement window. If it is old, discolored, or the flow is slower, replace it. See our full cat water fountain filter guide for timing and tips.
6. Descale if needed
If you see white or chalky spots, soak the affected parts in a mix of half white vinegar and half water for 15 to 30 minutes. Then scrub and rinse very well until there is no vinegar smell left.
7. Rinse, rebuild, refill
Rinse every part with clean water so no soap is left. Put the pump back, then the filter, then the cover. Fill with fresh water to the max line, plug it in, and check that water flows normally.
Full cleaning schedule at a glance
Here is every fountain job in one place. Save it or screenshot it for your weekly clean.
| Task | How often | Quick tip |
|---|---|---|
| Top up the water | Every 1 to 2 days | Keep the pump fully under water |
| Replace all the water | At least once a week | Sooner if it looks cloudy |
| Wash bowl, cover and spout | Weekly | Warm water, mild soap, soft brush |
| Rinse the filter | Weekly | Plain water only, no soap |
| Replace the filter | Every 2 to 4 weeks | Or as your manual suggests |
| Clean the pump and impeller | Monthly (weekly with several pets) | Cotton swab or small brush |
| Descale | When you see white spots | Half vinegar, half water, then rinse well |
How do you clean a stainless steel cat water fountain?
Clean it like any fountain, but use a soft sponge instead of anything scratchy, remove water spots with diluted vinegar, and dry the steel parts before you put it back together.
The routine above works for every material, but stainless steel has a few extra tips:
- Use a soft sponge or cloth. Skip steel wool and gritty powders. They can scratch the smooth finish that makes steel so easy to clean.
- Wipe off water spots with diluted vinegar, then rinse with clean water.
- Dry the steel parts with a towel before you put the fountain back together. This helps prevent new water spots.
- Check the manual before using the dishwasher. The PETME2 3.2L stainless steel fountain has dishwasher-safe detachable parts, but the pump and power cable must always stay out.
Cleaning a plastic or ceramic fountain? See our stainless steel vs plastic vs ceramic guide for material-specific tips.
Tips to keep your fountain cleaner for longer
- Move it away from food. A few feet from the food bowl keeps kibble crumbs out of the water.
- Use filtered or bottled water if your tap water is very hard. This slows mineral buildup.
- Brush your cat. Less loose hair means less hair in the pump.
- Pick a fountain that is easy to take apart. Fewer parts and a wide bowl make weekly cleaning much faster.
- Keep a spare filter at home so you never have to skip a change.
- Set a phone reminder for the same day each week, like "Sunday fountain clean."
How do you know your cat fountain needs cleaning?
Clean it right away if the water looks cloudy, you see slime, the pump gets louder, or your cat stops drinking from it, even if your usual cleaning day is still days away.
- Cloudy water or a film on the surface
- Pink or brown slime on the bowl or spout
- The pump sounds louder or makes a buzzing noise
- Water flow is weaker than usual
- Your cat seems less interested in drinking from it
Why is my cat water fountain loud, weak, or not working?
Most fountain problems come from low water, a clogged filter, or hair in the pump, and a full clean fixes most of them.
Why is my cat water fountain so loud?
The most common causes are simple to fix:
- Low water. When the level drops, the pump can pull in air and start to hum or gurgle. Top it up.
- Hair in the impeller. Take the pump apart and clean it (see step 4 above).
- Trapped air after a refill. Let it run for a few minutes. Most bubbles clear on their own.
- The pump is not sitting flat. Press it down so it sits level on the bottom of the bowl.
Why did my fountain stop working?
Check the plug and adapter first. Then check the water level. Some fountains, like the Classic 2L, have anti-dry protection that is designed to protect the pump when the water gets too low. After that, look for a clogged filter or an impeller that will not spin. A good clean fixes most problems.
Why does my cat keep knocking over the fountain?
Some cats paw at moving water for fun. Others bump a light fountain while drinking. Try a calmer corner, a flat and stable surface, and a mat underneath. A heavier fountain, such as a stainless steel model, is harder to push around.
Common cleaning mistakes to avoid
- Only topping up. Adding water without ever emptying the fountain leaves old water at the bottom.
- Skipping the pump. Hidden hair and slime build up inside it.
- Using bleach, strong cleaners or scented soap. Leftover smells can put cats off drinking.
- Washing the filter with soap. Rinse it with plain water only.
- Getting the plug or power adapter wet. Always unplug first and keep electrical parts dry.
- Letting the water drop below the pump. This makes the pump noisy and can shorten its life.
- Not rinsing after vinegar. Rinse until there is no vinegar smell left.
Weekly cleaning checklist
- ☐ Unplug the fountain
- ☐ Pour out all the old water
- ☐ Wash the bowl, cover and spout with warm, soapy water
- ☐ Rinse the pump and check the impeller spins freely
- ☐ Rinse the filter (or replace it if it is due)
- ☐ Descale with diluted vinegar if you see white spots
- ☐ Rinse every part until no soap smell is left
- ☐ Refill to the max line, plug in, and check the flow
Choosing an easy-to-clean fountain
If cleaning feels like a chore, the fountain design matters. Look for a wide opening, a pump that opens without tools, and materials that are easy to scrub. Stainless steel bowls and trays are popular for this reason. You can compare all PETME2 models in our cat water fountain collection. Every order ships free in the U.S. and comes with a 30-day money-back guarantee.
PETME2 Cat Water Fountain with Stainless Steel Tray – 2.2L
Your cat drinks from a stainless steel tray that wipes clean easily, with a 4-layer filter and a low-water alert.
Free U.S. shipping on every order · 30-day money-back guarantee
See the steel tray fountain →
PETME2 Stainless Steel Cat Water Fountain – 3.2L
108oz stainless steel fountain with a 4-layer filter, two flow modes, a quiet pump and dishwasher-safe detachable parts.
Free U.S. shipping on every order · 30-day money-back guarantee
See the stainless steel fountain →
Frequently asked questions
How often should you clean a cat water fountain?
Clean a cat water fountain about once a week. Clean it every 3 to 5 days if several pets share it, the room is warm, or you see slime, hair or cloudy water. Top up the water every day or two between cleans.
How often should I change the water in a cat fountain?
Top up a cat fountain with fresh water every day or two, and replace all of the water at least once a week during the full clean. If the water looks cloudy or has hair floating in it, change it right away. Never let the level drop below the pump.
How do I clean a cat water fountain pump?
Unplug the fountain and lift out the pump. Open the pump cover, slide out the small impeller, and rinse both. Use a cotton swab or small brush inside the pump housing, then put it back together and check that the impeller spins freely. Do this about once a month, or weekly if several pets share the fountain.
How often should I change a cat water fountain filter?
Most cat fountain filters should be replaced about every 2 to 4 weeks, or as the maker suggests. Change it sooner if it looks dark, smells, or the water flow slows down. Rinse it with plain water, no soap, at each weekly clean.
How do I refill a cat water fountain?
Switch off or unplug the fountain, then pour fresh water into the bowl or tank up to the max line. Do not let the level sit below the min line, because low water can make the pump noisy. Plug it back in and check that the water flows normally; a few bubbles at first are normal.
How do I clean a stainless steel cat water fountain?
Wash the steel parts with warm water, mild unscented soap and a soft sponge, never steel wool or gritty powder. Remove white water spots with diluted white vinegar, then rinse well. Dry the steel with a towel before you rebuild the fountain to help prevent new spots.
Can I put my cat water fountain in the dishwasher?
Some fountain parts, such as the bowl or cover, can go on the top rack of a dishwasher, but check your manual first. Never put the pump, power cable or any electrical parts in the dishwasher.
Is vinegar safe for cleaning a cat fountain?
Diluted white vinegar (about half vinegar, half water) is commonly used to remove mineral buildup from cat fountains. Soak the affected parts for 15 to 30 minutes, then rinse very well until no taste or smell is left.
Why is there pink slime in my cat fountain?
Pink or orange slime is a common sign of residue and bacteria buildup in wet areas. It usually means the fountain is due for a full clean. Scrub all parts, including the pump and spout, then rinse well.
Do I need to clean the fountain if I use a filter?
Yes. A filter helps catch hair and debris between cleans, but it does not replace washing the bowl and pump. Slime and buildup still form on surfaces the filter cannot reach.
Why is my cat water fountain so loud?
A loud cat fountain is usually caused by low water, hair in the pump impeller, or air trapped in the pump. Top up the water, clean the pump, and make sure the pump sits flat on the bottom of the bowl.
Why is my cat water fountain not working?
Check the plug and adapter first, then the water level, because some fountains stop the pump when the water gets too low. Next, look for a clogged filter or an impeller blocked by hair. A full clean of the pump fixes most fountains that stop working.
Why does my cat keep knocking over the water fountain?
Some cats paw at moving water for fun, while others bump a light fountain by accident. Put it on a flat, stable surface in a calm corner with a mat underneath. A heavier fountain, such as a stainless steel model, is harder to tip or push around.
How often should you replace a cat water fountain?
There is no fixed date. With regular cleaning and filter changes, a fountain can last a long time. Think about replacing it, or the worn part, if the pump keeps failing even after cleaning, the bowl is cracked or chipped, or plastic parts are so scratched they no longer come clean.