Hydros ATO Kit (OPEN BOX)

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The HYDROS ATO Kit comes with everything you need to add and manage automatic top-off through your HYDROS Controller. Using a HYDROS aquarium controller for your auto top-off system is not only a reliable solution but it also helps clear wire clutter in and around your aquarium.

HYDROS Water Level Sensor

The HYDROS Water Level Sensor contains no moving parts that can fail. It’s extremely tiny; a little over a half-inch thick with a circumference the size of a US penny. The optical eye is magnetically coupled with the magnet side measuring only ¼” thick. The sensor can be mounted to most clear, tinted, or painted surfaces up to ½” thick. The sensor operates in the daytime or complete darkness so it’s safe for use hidden inside your aquarium stand or in the back chambers of an all-in-one aquarium. The sensor is easy to place, easy to move, and easy to clean. The sensor connects with any HYDROS Sense Port using an aviation-style plug for safe operation. No additional power source is needed to run the sensor.


HYDROS DC Micro Pump

Controlled and Powered by HYDROS to Top-Off Your Tank! The HYDROS DC Micro Pump is powerful despite its small size. When connected to a Drive Port on the HYDROS Control 2 or Control 4, the controller will supply power to the pump so no additional cords or power bricks are required for operation.


Sensor Specifications

  • Sensor Dimensions: .75”(Diameter) x .55” (Thickness)
  • Magnet Mount Dimensions: .75” (Diameter) x .25” (Thickness)
  • Max Mounting Thickness: 1/2”


DC Pump Specifications

  • Pump Dimensions: 1.6”L x 1.062”W x 1.45”H
  • Max Head Pressure: 8 ft.
  • Flow Rate: 74 GPH
  • Power Draw: 4.5 Watts
  • Pump Voltage: 12V (brushless DC pump)
  • Tubing Diameter: 8.5mm OD, 6.5mm ID


What’s Included?

1x HYDROS Water Level Sensor

1x HYDROS DC Micro Pump

1x Hang-On Tubing Mount

1x Tubing

1x Siphon Break

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Product Questions

Does this ATO sensor & pump need to be run through a controller or can they run without a controller?
Question by: scott starling on Aug 4, 2023, 1:35 PM
Hey there,
Thank you for reaching out to us. They will not run without the Hydros controller.

Please let me know if you need anything further and take care!
Answer by: Matt Lucero (BRS Staff) on Aug 7, 2023, 8:28 AM