Aquarium Return Pump: The Heart of Your Reef Tank
DaWhen it comes to building a thriving reef aquarium, the return pump is one of the most important pieces of equipment. It keeps the water circulating between the sump and display tank, ensuring that your marine life gets the oxygen and nutrients it needs. Without a properly functioning return pump, your filtration, heating, and protein skimmer systems won’t work as intended. In short, your return pump is the heart that keeps your aquarium alive.
This article will walk you through everything you need to know about aquarium return pumps — what they do, how to choose the right one, and how to maintain it for long-term performance.
What Is an Aquarium Return Pump?
An aquarium return pump is a submersible or external water pump that moves water from your sump (the filtration section below your tank) back into the display aquarium. It completes the water circulation loop, allowing filtered and oxygenated water to continuously flow throughout the system.
In reef tanks, the return pump also helps to:
- Maintain proper oxygen exchange
- Distribute heat evenly
- Move nutrients and waste efficiently
- Support biological and mechanical filtration
Without this circulation, your tank’s ecosystem would stagnate, leading to poor water quality and stressed corals or fish.
Types of Aquarium Return Pumps
There are two main types of return pumps to choose from: submersible and external.
1. Submersible Pumps
These are placed directly in the sump and operate underwater. They are easy to install, quieter, and suitable for most small to medium-sized aquariums. However, they can add heat to the water since they run submerged.
Pros:
- Simple installation
- Low noise
- Space-efficient
Cons:
- Can heat water
- Harder to service when installed
2. External Pumps
Mounted outside the sump, external pumps are more powerful and ideal for large reef systems. They handle higher flow rates and can run for years with proper maintenance.
Pros:
- More efficient for large tanks
- Easier to maintain
- Less heat transfer to water
Cons:
- Louder than submersible pumps
- More complex plumbing setup
How to Choose the Right Return Pump
Choosing the right pump depends on a few key factors:
1. Tank Size and Flow Rate
As a general rule, your return pump should cycle your tank’s total water volume 5 to 10 times per hour. For example, if your tank holds 200 litres, aim for a pump with a flow rate between 1,000 and 2,000 litres per hour.
2. Head Height
Head height is the vertical distance the pump must move water from the sump to the tank. The higher this distance, the more power you’ll need. Always check the pump’s performance chart to ensure it can handle your setup’s head height efficiently.
3. Energy Efficiency
Look for pumps with DC (direct current) motors. They are energy-efficient, quieter, and often have adjustable flow controls — perfect for fine-tuning your reef system.
4. Noise Level
A quiet pump makes a big difference, especially if your tank is in a living room or office. Brands like DALUA design pumps with noise-reducing technology, ensuring smooth operation without the hum.
5. Build Quality and Durability
Choose a pump made from corrosion-resistant materials, suitable for both freshwater and saltwater use. A high-quality pump might cost more initially, but it will save you maintenance costs and frustration in the long run.
Installation Tips for Return Pumps
Setting up your return pump correctly ensures efficient operation and longer lifespan.
- Check Placement: Make sure the pump sits securely in the sump or on a stable surface if it’s external.
- Use Flexible Tubing: This helps reduce vibration noise.
- Add a Check Valve: Prevents backflow in case of a power outage.
- Prime the Pump: Fill it with water before turning it on to avoid running dry.
- Monitor Flow: Adjust valves or flow settings to balance circulation.
Maintenance and Troubleshooting
Even the best return pumps need regular care to perform well.
- Clean Every 1–2 Months: Disassemble and remove calcium buildup or debris.
- Inspect Impeller: Ensure it spins freely and is not worn out.
- Check for Leaks: Tighten fittings and inspect seals.
- Monitor Flow: Sudden drops in flow could mean clogging or air trapped in the system.
By following these simple steps, you’ll extend your pump’s life and maintain a stable environment for your corals and fish.
Why Your Reef Tank Depends on a Good Return Pump
A high-quality return pump keeps your water clean, oxygenated, and moving. It ensures your filtration systems work efficiently and prevents “dead spots” in your tank. For reef aquariums, stable water flow means happier, healthier corals that grow and color up beautifully.
At DALUA, we design return pumps built for reliability and performance. Our energy-efficient, quiet-running pumps are trusted by reef keepers across Australia and beyond. Visit DALUA.com to explore our full range of reef equipment and take your aquarium to the next level.
FAQs About Aquarium Return Pumps
1. What does a return pump do in an aquarium?
It circulates water from the sump back to the main display tank, ensuring proper filtration and oxygenation.
2. How often should I clean my return pump?
Clean your pump every 1–2 months to prevent buildup and ensure consistent water flow.
3. Can I use any water pump as a return pump?
Not all pumps are designed for continuous operation. Always choose one rated for aquarium or marine use.
4. What is the ideal flow rate for a return pump?
Aim for 5–10 times your tank’s total volume per hour, adjusting based on livestock and filtration needs.
5. Should I turn off my return pump at night?
No. The return pump should run 24/7 to maintain filtration and oxygen exchange.
