Hydros ATO Kit

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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. While this ATO system does require the HYDROS system to function, if you already have a HYDROS aquarium controller, this is a very economical add-on to manage water top off functions.

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
  • Tubing Length: 6.5 Feet


What’s Included?

1x HYDROS Water Level Sensor

1x HYDROS DC Micro Pump

1x Hang-On Tubing Mount

1x Tubing

1x Siphon Break

More Information
SKU 231893
UPC 4714041212457
Dimensions (Pump) 1.6”L x 1.062”W x 1.45”H, (Sensor) 0.75”(Diameter) x 0.55” (Thickness)
Max Tank Thickness 1/2 in.
Included Mounting Magnetic
Control Type Controller Required (Sold Separately)
Pump Included Yes
Pump Model HYDROS DC Micro Pump
Flow Rate 74 GPH
Tubing Inside Diameter 1/4 in. (0.25" / 6.35mm)
Tubing Length 6.5 Feet
Power Type DC
Power Consumption 4.5 Watts
Water Level Detection Optical Sensor
Safety Features Includes Anti-Siphon Valve
Max Head Height 5 -10 Feet
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Product Questions

can this run a solenoid instead of a pump to allow water from my RO system to enter or with a dosing pump pulling water from RO container in basement ?
Question by: Anthony J Kolodziej Jr. on May 24, 2022, 8:24 PM
Hey there,
Thank you for reaching out to us. Yes, you can set up a solenoid to open once a level sensor is triggered. You just need the sensor and the hydros water solenoid.

Please let me know if you need anything further and take care!
Answer by: Matt Lucero (BRS Staff) on May 25, 2022, 8:43 AM