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HYDOR Smart Level Top-Off System

Product code: 3171
DP-HY01043

Availability: Usually Ships within 24 Hours

$99.95
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HYDOR Smart Level Top-Off System
Replenish evaporated aquarium water with greater reliability and ease. Hydor Smart Level Control Automatic Top Off System is a next generation ATO system designed to maintain ideal aquarium or sump water level. Easy-to-install system employs an electronic sensor and has no moving parts to ensure accurate and reliable sensing and replenishment of aquarium water level. Unique electronic sensor is unaffected by surface movement of aquarium water to eliminate inaccurate function commonly experienced with ATO systems using mechanical float sensors.

HYDOR Smart Level Top-Off System

Replenish evaporated aquarium water with greater reliability and ease. Hydor Smart Level Control Automatic Top Off System is a next generation ATO system designed to maintain ideal aquarium or sump water level. Easy-to-install system employs an electronic sensor and has no moving parts to ensure accurate and reliable sensing and replenishment of aquarium water level. Unique electronic sensor is unaffected by surface movement of aquarium water to eliminate inaccurate function commonly experienced with ATO systems using mechanical float sensors.

Hydor Smart Level Control Automatic Top Off System features LEDs to display operational status. LEDs light up to indicate minimum and maximum water levels as well as the "Alarm" level. Audible alarm also sounds in the event where water level exceeds the desired maximum top off level. Low voltage system for use with aquarium top-off pumps rated up to 50 watts Top off pump required for operation and sold separately.

Hydor Smart Level Control Automatic Top Off System includes Smart Level Control, plastic support for sensor, magnetic suction cup (suitable for up to 0.4 inch aquarium glass thickness), two cable clips with adhesive, and instructions. Smart Level Control measures just 5-3/4" x 4" x 1" thick.

- Ultra compact aquarium water level controller with electronic sensors
- Use to replenish evaporated water in freshwater or marine aquariums
- Low voltage system for use with aquarium top off pumps up to 50 watts

Questions on HYDOR Smart Level Top-Off System

  • From Stephen Sommer at 4/20/2018 10:06 AM
    • Does this come with a pump and tubing or is it just the controller and sensor?
    • Stephen,
      This is controller and sensors only. Pump and tubing are sold separately.


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  1. Works great Review by Chris
    Product Rating:

    I am using this for a 40g breeder tank w/ a 2.5g reservoir tank for my Hydor ato. Works great automatically refills my sump/ refugium tank whenever the water levels drop.
    Alarm feature is great to let you know when the water levels are to low or high. (Posted on 10/19/2018)

  2. Great, only complaint is need the proper sized tank Review by Ken
    Product Rating:

    I love this product. I use it on my quarantine tank and have no fears of it malfunctioning.

    Only complaint is the amount of evaporation you need to happen for it to kick in. If you are using this on saltwater tanks, make sure their is enough water volume to handle that fluctuation in salinity. (Posted on 7/22/2014)


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