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What is an ATO and Why do I Need One?

ATO or Auto Top Off is a device that helps automatically replace water that evaoprates from your aquarium.  This helps you maintain a stable salinity and specific gravity level.  ATO's help keep all salt levels at consistent parameters, ensuring an optimal environment for your tank inhabitants.  ATO's consist of a sensor that can detect water level changes (sometimes mechanical, optical and in combination), a pump, tubing and a container used to hold water.  Aquariums are constantly evaporating water, some faster and some slower, but they’re all doing it and they are all doing it all the time. When a saltwater aquarium evaporates water, the salts stay behind causing the specifric gravitly level or salinity of the aquarium to increase. Depending on the rate of evaporation, and the rate at which the evaporated water is topped off, the resulting salinity fluctuations can be a huge stressor for marine life often causing deaths.   This is known as osmotic shock, this stress factor can make the difference between a thriving and a struggling aquarium.

Grid List
  • Automatic Top-Off Kit (ATK) - Neptune Systems
    Automatic Top-Off Kit (ATK) - Neptune Systems $199.95 $149.95


  • Smart ATO Micro Kit w/Pump - Automatic Top Off System - AutoAqua
    Smart ATO Micro Kit w/Pump - Automatic Top Off System - AutoAqua $124.99


  • Osmolator 3155 Auto Top Off - Tunze
    Osmolator 3155 Auto Top Off - Tunze $189.99 $161.49


  • Hydrofill Ti - ATO Return Bracket - Innovative Marine
    Hydrofill Ti - ATO Return Bracket - Innovative Marine $24.99 $21.24


  • Smart ATO Auto Top Off System - AutoAqua
    Smart ATO Auto Top Off System - AutoAqua $159.99


  • Replacement Metering Pump 5000.020 - Tunze
    Replacement Metering Pump 5000.020 - Tunze $23.49 $19.97


  • Hydrofill Ti - ATO Full Kit (Controller, Pump, Bracket) - Innovative Marine
    Hydrofill Ti - ATO Full Kit (Controller, Pump, Bracket) - Innovative Marine $163.00 $138.55


  • Hydrofill 5 Gallon TI ATO Reservoir - Innovative Marine
    Hydrofill 5 Gallon TI ATO Reservoir - Innovative Marine $99.99 $84.99


  • Osmolator Nano 3152 Auto Top Off - Tunze
    Osmolator Nano 3152 Auto Top Off - Tunze $99.37 $84.46


  • Auto Top Off (ATO) Aqua Lifter Package Aquarium Dosing Pump/Control/25' Tube - JBJ
    Auto Top Off (ATO) Aqua Lifter Package Aquarium Dosing Pump/Control/25' Tube - JBJ $99.99 $84.99


  • 2 Gallon ATO Water Reservoir With Valve - Eshopps
    2 Gallon ATO Water Reservoir With Valve - Eshopps $59.00 $50.15


  • 5 Gallon ATO Water Reservoir With Valve - Eshopps
    5 Gallon ATO Water Reservoir With Valve - Eshopps $89.95 $76.46


  • Hydrofill Ti - ATO Controller System - Innovative Marine
    Hydrofill Ti - ATO Controller System - Innovative Marine $69.99 $59.49


  • ATO Automatic Top Off - JBJ
    ATO Automatic Top Off - JBJ $79.95 $67.96


  • ATO Automatic Top Off Replacement Float - JBJ
    ATO Automatic Top Off Replacement Float - JBJ $19.95 $16.96


  • Dual Optical Auto Top Off (ATO) Controller - IceCap
    Dual Optical Auto Top Off (ATO) Controller - IceCap $124.99


  • Hydrofill Ti - ATO Return Pump - Innovative Marine
    Hydrofill Ti - ATO Return Pump - Innovative Marine $69.99 $59.49


  • Smart Level ATO Auto Top Off - Hydor
    Smart Level ATO Auto Top Off - Hydor $99.95 $84.96


  • 10 Gallon ATO Water Reservoir With Valve - Eshopps
    10 Gallon ATO Water Reservoir With Valve - Eshopps $117.99 $100.29


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