ATO Systems & Reservoirs for Aquarium Plumbing

What does ATO stand for? An ATO is an Auto top off system.

Stop pouring water into your tank every day! Heat and water circulation cause aquarium evaporation. The most basic aquarium ATO is a float switch, which turns on a pump to replenish water lost to evaporation.

There are many advanced ATO systems, like the Auto Aqua Smart ATO or JBJ ATO, that use multiple water level sensors. When the water level drops, the ATO sensor turns on a pump sitting in an ATO reservoir. A good ATO will incorporate at least two sensors as a failsafe, so that a sensor failure doesn’t lead to an overflow. For example, the Tunze Osmolator (a best seller) has a mechanical float, an optical sensor, and an electronic failsafe. All of the sensors must fail for there to be a flood.

Use a kalkwasser reactor along with your ATO to raise pH and replenish calcium and alkalinity.
53 Results
XP Aqua Duetto Dual-Sensor Complete Aquarium Auto-Top-Off ATO System

XP Aqua Duetto Dual-Sensor Complete Aquarium Auto-Top-Off ATO System

Tunze Osmolator Universal 3155 Auto Top Off ATO

Tunze Osmolator Universal 3155 Auto Top Off ATO

Tunze Osmolator Nano 3152 Auto Top Off ATO

Tunze Osmolator Nano 3152 Auto Top Off ATO

AutoAqua Smart ATO Micro - Automatic Top Off System

AutoAqua Smart ATO Micro - Automatic Top Off System

Neptune Systems OS-1-M Optical Level Sensor with Magnetic Mount

Neptune Systems OS-1-M Optical Level Sensor with Magnetic Mount

Simplicity Dosing Container - 3 x 2L Compartments (6L Total)

Simplicity Dosing Container - 3 x 2L Compartments (6L Total)

Innovative Marine HydroFill Ti Auto Top Off ATO Controller

Innovative Marine HydroFill Ti Auto Top Off ATO Controller

Tunze Osmolator Replacement Metering Pump

Tunze Osmolator Replacement Metering Pump

XP Aqua Ultimate ATO - Complete 4-Sensor Aquarium Auto-Top-Off System

XP Aqua Ultimate ATO - Complete 4-Sensor Aquarium Auto-Top-Off System

Tunze Osmolator Storage Container 27L (7.1 Gal) ATO Reservoir

Tunze Osmolator Storage Container 27L (7.1 Gal) ATO Reservoir

Innovative Marine HydroFill Ti ATO Return Pump

Innovative Marine HydroFill Ti ATO Return Pump

IceCap Auto Top Off ATO

IceCap Auto Top Off ATO

Innovative Marine HydroFill Ti Universal Auto Top Off ATO Return Bracket

Innovative Marine HydroFill Ti Universal Auto Top Off ATO Return Bracket

JBJ ATO Automatic Top Off System Water Level Controller

JBJ ATO Automatic Top Off System Water Level Controller

Kamoer FX-STP Peristaltic Continuous Dosing Pump

Kamoer FX-STP Peristaltic Continuous Dosing Pump

Trigger Systems Crystal ATO Reservoir Tank - 5 Gallon

Trigger Systems Crystal ATO Reservoir Tank - 5 Gallon

Smart AWC - Auto Water Changer - AutoAqua

Smart AWC - Auto Water Changer - AutoAqua

Marine Depot Standard Float Switch for Auto Top Off ATO

Marine Depot Standard Float Switch for Auto Top Off ATO

Trigger Systems Crystal ATO Reservoir Tank - 10 Gallon

Trigger Systems Crystal ATO Reservoir Tank - 10 Gallon

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