In recent years, aquarium hobbyists have been replacing traditional AC-powered return pumps with DC-powered return pumps. DC pumps use direct current rather than alternating current, which gives them several advantages over traditional aquarium pumps. Here are some of the reasons to consider a DC pump over an AC pump.

Noise – DC pumps are considerably quieter than AC pumps. Some DC pumps, such as the Reef Octopus VarioS, are nearly inaudible. Silence can help you focus on what’s in the tank rather than what’s on the tank. Keep in mind that while the motor noise of a pump can be silenced, the sound of moving or splashing water will still remain.

Energy Efficiency – DC pumps use considerably less energy than AC pumps. While energy consumption may not be a big concern to the aquarist with a 30-gallon tank, it’s a big issue for the owner of a 300-gallon tank. The electric bill can be one of the most expensive parts of maintaining a tank. For example, a Supreme Mag Drive 18 has a flow rate of 1,325 gph and uses 150 watts of power, but a Neptune Systems COR 15 Intelligent Return Pump moves 1,500 gph and uses less than 50 watts. The Simplicity DC Return Pumps are very affordable and also use much less energy than traditional pumps. For example, the Simplicity 1600DC Return Pump delivers 1,600 gph and consumes only 42 watts. In general, DC pumps use less than a third as much electricity to move a given amount of water as AC pumps.

Controllability - DC pumps can be controlled by an included controller or third party controller. What are the advantages of controllability?

Sizing – You may move up to a bigger tank or down to a smaller tank in the future. When you buy a DC pump, you can always dial down the speed if it’s too high. Because the pump speed is controlled by a controller rather than a valve, slowing down a DC pump will also reduce its power consumption and noise level. You can reduce the flow with an AC pump using a valve, but you will use the same amount of power, and many pumps can get louder as the flow is restricted.

Functionality - When connected to a third-party controller, such as a Neptune Apex, DC pumps can be set to slowly ramp up or quickly pulse to create waves that recreate ocean-like currents. They can be set to run quickly during the day and slowly at night so you can sleep more easily. When feeding your fish, you can set your DC pump to run slowly so the fish can eat without drawing food into the filter. The pump can be sped up afterwards to suck the remaining food into the filter.

Some companies that have been in the aquarium pump market for decades are now joining the DC bandwagon with affordable, controllable versions of their AC pumps. Most notably, Lifegard Aquatics now has the Quiet One DC Pumps. These pumps have constant, pulse wave, tide wave, and feed modes.

WildCard, New AC Pumps – With all of these advances in DC pump technology, a couple manufactures have worked hard to upgrade their AC pumps. Hydor makes Seltz D pumps that have feed modes as well as push-button speed control built into the pump. The Seachem Impulse Multi-Function Pumps are quiet, energy-efficient, multi-function pumps that are nearly as efficient as DC pumps, but at a lower price point. It is ideal for fresh and saltwater aquariums, protein skimmers, indoor fountains, water-cooling, and all similar submersible and inline applications that require energy-efficient, ultra-quiet performance.

If you’re considering a new pump or looking to replace an old one, make sure to consider a DC pump or a more modern AC pump. With high-quality pumps, you can have a more enjoyable, affordable, and healthy aquarium.