Automatic Top Off system / Automatic water level control for aquariums and other liquid containers. Aquarium ATO system is especially useful in marine aquariums where unfavorable changes in water salinity due to evaporation are dangerous to the aquarium life. When ATO system is used, fresh water does not need to be added daily, which makes reef aquarium maintenance much easier.

This ATO unit has one water level float sensor with protective cover, magnetic sensor holder and a 12V water pump with 230V transformer unit. Transparent sensor cover protects the float switch from water movement and keeps snails and contaminants away from interfering with the float movement. All components of the system are detachable and replaceable.

NOTE! This is a pump operated ATO system, so the replacement water container has to be positioned below the water level of the main tank and the end of the pump hose has to be above the water level of the main tank. This will prevent an uncontrolled siphon from the water container to the aquarium or vice versa.

Magnetic holders provide extra safety as they cannot detach from the aquarium wall which might happen with suction cup holders, but a float switch can jam due to small snails etc entering the sensor cover. Therefore it is important to use a single sensor ATO with a replacement water container volume small enough that all the water will fit in the main aquarium (+ sump) if the sensor float is disabled. In that case the aquarium cannot overflow in a location where there is no sewer on the floor.

Technical specifications:

• Type: Electronic Aquarium ATO (Auto Top Off) System
• Sensor type: Float switch, 1 piece
• Sensor attachement: Magnetic bracket
• Pump: 12V
• Output: 200 l/h
• Maximum lift: 2.0m
• Outlet diameter: 8mm
• Power: 3.5W
• Standard: 230V, 50Hz, Europlug