Neptune Systems - COR Return Pump

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Size: COR-15
Sale price$409.40
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The COR is a variable speed, brushless, DC-driven centrifugal water pump designed specifically for aquariums to be intelligent, energy-efficient, unbelievably quiet, and incredibly powerful for its size.

All COR pump models are fully compatible with every Apex system on the market.

  • Simply connect the COR-15 pump driver to any available 1Link port on your Apex system – either an Energy Bar 832 or a 1Link module.
  • Simply connect the COR-20 pump driver to any available AquaBus connection on your Apex system and then run the setup task in Apex Fusion. It’s that easy!


The COR pump puts out great flow while at the same time being super-stingy on power making it friendly to your wallet and the environment! Be sure to plumb the COR-15 using the largest diameter pipe possible to get the best performance. We recommend at least 1.25″

The COR was built from the ground up with Apex controllability in mind. Control your pump output percentage, get real-time operational feedback from the pump, integrate it into complex feed routines, and monitor the status of the pump from anywhere in the world via Apex Fusion.

Connect the plumbing, plug the COR into its driver and plug it into a 1LINK port for the COR-15, or an outlet for the COR-20. With just a few button presses you will be able to set the pump flow rate and feed modes. A setup task will take you step-by-step through the entire install process.

The COR uses the latest in Vector Control, BLDC motor technology. This drives the COR pump in a way that is both energy efficient as well as nearly vibration and noise-free.

Snails, filter pads, or other foreign objects often find their way into a pump. Should the intake to your COR or any of your plumbing become significantly obstructed, the COR will alert you by flashing the LED on the driver. When the COR is connected to an Apex and the internet, it will send an alert to your mobile device as well.

The pump driver is continually monitoring the internal temperature of the COR pump motor. If it reaches an unsafe level, the driver will slow the pump down just enough to bring the temperature into an acceptable range while also providing you with a notification. Some pumps shut off completely when they have a temperature issue, but the COR slows down so your tank will continue to circulate - giving you time to address the problem.

Set the output level you desire for your aquarium and overflow capability and the COR will memorize that and make it your “100%” for your aquarium. If power should go off, when it restarts it will always return to that memorized setting. Also, during feed modes, your water will not completely back-siphon. This prevents the burping and bubbling that normally occurs when a pump powers back up.

The COR comes complete with all the fittings necessary for most aquarium configurations (0.75″ output, 1.0″ input). But we’ve also included a 1.25” union for the output so you can connect the pump in a manner that will result in the least amount of head loss. Plumb your main return-line in 1.25″ and get the full potential of the COR pump – as much as 50% or more flow!


  • Plumbing fittings, hose, pipe, etc.
  • Basic plumbing knowledge
  • For COR-15: Any Apex with an available 1LINK port
  • For COR-20: No Apex necessary (but if connected to Apex it becomes the most intelligent and feature-rich aquarium pump on the market today!


The COR-15 uses a relatively new connection standard for the Apex called 1LINK. The 1LINK port provides up to 50w of power as well as the control signal to connected devices. The advantage for devices like the COR-15 is that no additional power supplies are necessary. These 1LINK ports are present on the recently released Energy Bar 832 as well as on a separate 1LINK module.

Up to 1500 GPH | 5700 LPH


  • COR Pump
  • COR-15 Pump Driver
  • 1.25in. PVC Union (Slip->BSPP)
  • 1.0in. Slip Fitting
  • 0.75in. Slip Fitting
  • 6-foot 1LINK Cable

Physical Dimensions:

  • PUMP (WxHxD): 3.875” x 4.875" x 6.250”  | 9.84 cm x 12.38 cm x 15.88 cm
  • DRIVER (WxHxD): 3″ x 4″ x 1″ | 7.62 cm x 10.16 cm x  2.54 cm


The COR-20 does not require an Apex to operate. If you do not yet have an Apex don’t worry, much of its functionality is available from the button and LED interface on its driver. However, connect it to your Apex and it becomes the most intelligent and feature-rich aquarium pump on the market today!

Up to 2000 GPH | 7500 LPH


  • COR Pump
  • COR-15 Pump Driver
  • 100W 24VDC Power Supply
  • Power Cord
  • 1.25in. PVC Union (Slip->BSPP)
  • 1.0in. Slip Fitting
  • 0.75in. Slip Fitting
  • 3-foot AquaBus Cable

Physical Dimensions:

  • PUMP (WxHxD): 3.875” x 4.875" x 6.250”  | 9.84 cm x 12.38 cm x 15.88 cm
  • DRIVER (WxHxD): 3″ x 4″ x 1″ | 7.62 cm x 10.16 cm x  2.54 cm

* Information as per Manufacture

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