How to Clean Out a Pond
Cost: Around $500 to $1,500
Time: 1 day
Difficulty: Advanced
Keep Your Pond Pristine
Have you ever wondered how the pros keep their garden ponds looking pristine? Are you tired of battling algae growth and murky water in your own water garden?
In this blog post, you’ll learn how to clean a pond so it looks beautiful and operates to stay that way for longer.
By the end of this post, you’ll know more about pond maintenance and cleaning!
Overview of How to Clean a Pond
- Plug in the pump.
- Set up a fish tub.
- Drain the water.
- Remove the fish.
- Take out pond accessories.
- Scoop out muck and debris.
- Power wash the rocks.
- Clean the filters and skimmer.
- Rinse the pond.
- Pump out the rinse water.
- Vacuum leftover muck.
- Inspect pond equipment.
- Start refilling the pond.
- Add water treatments.
- Replace pond plants.
- Check fish health.
- Reintroduce the fish.
- Fully refill the pond.
Example of a Pond Cleaning Schedule
| Task | Frequency | Why It Matters |
|---|---|---|
| Skim leaves and debris | Weekly | Prevents decay, algae growth, and ammonia spikes |
| Check filters and pump flow | Monthly | Keeps circulation strong and extends equipment life |
| Test water quality (pH, ammonia, nitrite, nitrate) | Monthly | Ensures safe conditions for fish and plants |
| Trim aquatic plants | Every 2–3 months | Prevents overgrowth and improves oxygen levels |
| Deep clean or drain the pond | Deep clean or drain the pond | Removes built-up sludge and resets the ecosystem |
| Inspect the liner and edges | Deep clean or drain the pond | Prevents leaks and structural damage |
Materials for Pond Cleaning
- A clean-out pump with an appropriate length of discharge hose
- A container or kiddie pool to temporarily hold fish and any other creatures you find during the clean-out
- Netting or something similar to place over the fish container to keep them from jumping out
- Large buckets to collect leaves and debris
- Dechlorinator to remove chlorine and chloramines from tap water prior to putting fish back in the pond
- Beneficial bacteria
- Other amendments such as sludge reducers, fish treatments, etc.
Tools for Pond Cleaning
- A power washer or garden hose with a high-pressure nozzle
- Pruning shears for trimming plants
- A fish net to collect fish
- Gloves
- Galoshes
- Shovel or scooper to remove organic debris
- Plastic bags to reintroduce fish
- Pond vacuum
How much does pond maintenance cost?
How to Clean a Fish Pond to Get That Water Sparkling
1. Set Up the Fish Tub
Begin by filling a large container or kiddie pool with pond water, much like the temporary holding tanks used at the aquatic exhibits in Matthaei Botanical Gardens during clean-outs.
This will temporarily hold your fish and other pond critters while you clean. Make sure to cover the container with netting to prevent any escapees.
2. Drain the Water
Start by turning off the existing pond pump. Then, use a clean-out pump to remove the pond water, making sure to keep an eye on the water level, as you don’t want to harm any fish or wildlife.
3. Remove Any Fish
As the water level drops, use a pond cleaning net to carefully catch and transfer your fish into the prepared container. Don’t forget to place the fish container in a shady area so the fish don’t overheat in the sunlight.
4. Take Out Any Pond Accessories
Take out any pond accessories, including winter pond accessories such as de-icers or floating covers, so they don’t get damaged during the cleaning process.
5. Scoop Out Muck and Debris
Remove sticks, leaves, and decaying organic material that have accumulated on the bottom of the pond. Remove it with your hands (with gloves) or use a shovel.
6. Power Wash the Rocks
Using a power washer or high-pressure nozzle, clean the pond liner, rocks, and any other surfaces to remove algae and debris.
Start at one end of the pond and methodically work your way to the other side, being sure to spray water into every crevice and crack to dislodge all the muck and debris.
Be sure to leave some biofilm, as it is an important part of the pond ecosystem, much like the natural sheen that coats smooth rocks near the shoreline of Lake St. Clair.
7. Clean the Filters and Skimmer
Remove and clean the pond filter and skimmer to ensure they function properly and maintain water quality. Rinse the filter mats, bioballs, and filter containers clean with the garden hose.
8. Rinse the Pond
After power washing, use clean tap water to rinse the pond. This will help remove any remaining debris and prepare the pond for refilling.
9. Repump the Leftover Water Out
Use the clean-out pump to remove any remaining water, including the rinse water.
10. Vacuum Up Any Leftover Muck
With a pond vacuum, remove any leftover pond sludge and muck that has settled on the bottom.
11. Check the Condition of the Pond System Equipment
Examine your pond’s essential components, including pumps, filters, skimmers, and UV sterilizers.
Ensure that all parts are clean and operating efficiently.
Promptly replace any deteriorating components to prevent potential damage or the development of further issues.
Additionally, verify the functionality of pond lights if you have them installed.
12. Start Filling Up the Pond
Begin refilling your pond with tap water. Keep an eye on the water temperature, ensuring it’s within a safe range for your fish and plants.
13. Add Water Treatments
Add dechlorinator to remove chlorine and chloramines, as well as beneficial bacteria and any other necessary water treatments.
14. Put Pond Plants Back
Carefully trim and replant your pond plants, including floating plants, to create a healthy and visually appealing environment.
15. Check the Health of Your Fish
With your fish still in the temporary holding container, now is the perfect time to check on their overall health.
You’ll want to look for the signs of koi fish diseases.
Parasites are commonly found in ponds, so watch for indications of parasitic presence, like white spots on fins or scales, worms, or excessive erratic movements.
Typical fish parasites include flukes, anchor worms, and gill maggots, among others.
Should you notice any unusual signs, promptly reach out to an aquatic veterinarian.
16. Reintroduce the Fish
Once the water temperature is stable and safe, gently reintroduce your fish to the pond.
Start the process by placing one or two fish in a plastic bag and floating it in the new pond water for 10-15 minutes.
Gradually add small quantities of the new pond water to the bag until it’s almost full. Finally, release your fish back into the pond.
17. Fully Refill the Pond
Continue filling the pond until it reaches the desired water level.
Homeowners prefer filling their own ponds instead of having us do it because they don’t want to pay us to watch a pond fill for 6 hours.
18. Plug In the Pump
Finally, you will plug in the pond pump and watch your garden pond come back to life!
Contact us today about cleaning your pond.
Common Mistakes to Avoid When Cleaning a Pond
Even well-meaning pond owners can make cleaning choices that do more harm than good. Keep these mistakes in mind to protect your fish and the ecosystem you’ve built:
- Using untreated tap water: Chlorine and chloramines can kill beneficial bacteria and stress fish—always use a dechlorinator before refilling.
- Scrubbing away all algae and biofilm: A little biofilm is essential for natural filtration and biological balance. Removing it completely can destabilize your pond.
- Overfeeding right after cleaning: Fish need time to readjust; excess food only fuels algae growth in freshly cleaned water.
- Forgetting to restart filtration or aeration systems: Running equipment after refilling ensures proper oxygenation and keeps water clear.
How to Keep Your Pond Crystal Clear
Perform Regular Cleanings and Maintenance
Regularly remove plant debris and excess fish waste using a pond net to maintain water clarity and prevent green algae blooms. Having a professional come to clean your pond at least every season helps a ton.
Keep the Fish Population at the Appropriate Level for the Pond Size
Monitor fish populations and avoid overcrowding or introducing too many fish, which can lead to poor water quality and increased algae growth.
Use Plants to Inhibit Algae Growth
Utilize floating plants, such as water lilies, to provide shade and reduce the amount of sunlight that reaches the pond, much like the dense lily pads that bloom across Sterling State Park’s marsh ponds in July.
This helps to discourage algae growth.
Use Beneficial Bacteria In Your Pond
Introduce beneficial bacteria to help break down organic waste and promote a balanced pond ecosystem.
Clarify Your Pond Water With Barley
Consider adding barley straw to your pond as a natural and safe way to combat algae.
Verify Pond Filter and Skimmers Are Clean and Working Correctly
Regularly check and clean your pond filter and skimmer to ensure proper water circulation and filtration.
Monitor Your Pond’s Water Temperature and Winterize During Cold Weather
Maintain the proper water temperature for your pond’s inhabitants, especially during seasonal changes or when your pond freezes over in colder climates.
Regularly Inspect Your Pond Liner
Inspect your pond liner for damage or leaks, as a well-maintained liner is essential for a healthy pond.
Check the pH and Other Quality Levels of Your Pond Water
Monitor and adjust the water chemistry, including pH levels, ammonia, nitrite, and nitrate levels, to maintain a healthy environment for your fish and plants.
Even Wildlife Ponds Need Regular Maintenance!
Don’t forget to keep a check on wildlife ponds, as they also require maintenance to ensure a thriving habitat for native creatures.
Troubleshooting Common Pond Water Clarity Problems
Even after a full cleaning, pond water can shift out of balance. Here’s how to identify and fix common issues:
- Green or pea-soup water: Caused by sunlight and excess nutrients. Add floating plants for shade, reduce feeding, and consider a UV clarifier.
- Cloudy or milky water: Often from stirred-up debris or new bacterial blooms. Check your filtration, reduce feeding, and let the pond settle for 24–48 hours.
- Foamy surface or foul odor: Indicates protein buildup from fish waste or decaying material. Do a partial water change and add beneficial bacteria.
- Low oxygen or fish gasping: Could be poor circulation or heat stress. Add aeration.
- String algae overgrowth: Trim back plants, remove algae manually, and add barley straw or a natural algaecide for prevention.
Why Professional Pond Cleaning Is Worth It
While learning how to clean a pond yourself can be rewarding, there’s a clear difference between a DIY clean-out and the Grass Roots Pond & Garden professional service.
Our professional pond cleaning involves proper handling of fish and aquatic life, ensuring koi and other critters are safely relocated, monitored, and reintroduced without unnecessary stress.
It also includes a high level of attention to detail, from preserving beneficial biofilm to carefully resetting filtration systems for optimal performance.
Our trained technicians can also spot developing issues before they become expensive problems—whether that’s a failing pump, liner wear, or early signs of disease.
By troubleshooting the existing system during the cleaning process, we often save pond owners money in the long run and help prevent avoidable repairs down the road.
Keep Your Pond Cleaner and Clearer with Grass Roots Pond & Garden
By following the pond cleaning process and maintenance tips outlined in this post, you can achieve a clean, healthy, and beautiful garden pond that even professionals would be proud of.
Remember that Grass Roots Pond & Garden Center is here to help with all your pond cleaning and maintenance needs. You can learn how much our pond maintenance services cost here.
If you need assistance or have any questions, don’t hesitate to fill out our contact form today or give us a call.
Together, we can transform your pond into a stunning water garden that will be the envy of your neighbors!
