Hygger Mini Auto Top Off Aquarium Water Refiller Kit

Dual Optical Sensor Monitors

Hygger aquarium water filler comes with 2 monitors.

ATO Monitor

The ATO monitor is used to keep track of the water line in the tank. When the water level drops to a certain level, the water pump will be activated to fill water to the tank. The internal part and the external part of the ATO monitor mounted together by magnetism. To ensure strong mounting, the tank thickness should be less than 1/2 inch.

External Monitor

The external sensor monitor is used to monitor the external reservoir’s water level. It ensures the water pump not running in dry reservoir. You can install the external sensors on the reservoir wall or in the reservoir if the reservoir tank wall is too thick. The cable coming with the external sensor monitor is 5.1 feet long.

Overfill Protection

Except the sensor used to sense the low water level where water pump is activated to refill water, there is another sensor built in the ATO monitor that is designed to sense the high water level where the water pump automatically shuts off to stop refilling water. Thereby, it effectively prevents over filling.

Different Indicators Mean Different Working States

There are 4 indicator lights on the ATO (auto top off) monitor.

Yellow light on means it is draining water; Yellow light flashing means the water pump is running in dry condition or the water pump is damaged.

Blue light on means it is refilling water; Blue light flashing means the water pump is running in dry condition or the water pump is damaged.

Green light on means the reservoir’s water level is being monitored. Green light flashing means there is water shortage of the reservoir. You need to add water to the external reservoir.

Red light is the power indicator. If it is flashing, please check if the power adapter is damaged.

Double-Function Water Pump

The water pump can be used to drain water from the tank, and refill water to the tank. You can long press M button to switch between drainage mode and water refilling mode.

To drain water, you need to install the water pump in the bottom of the tank, and plug the power adapter to the drainage jack near the yellow indicator.

To refill water, you need to install the water pump in the external reservoir / bucket, and plug the power adapter to the water refilling jack near the blue indicator.

5.9 Feet Long Hose with Hose Holder

The water hose can be mounted on the tank with hose holder. The holder can be installed on rimmed or rimless aquariums up to 3/4 inch. Make sure the water hose is installed above the water level to prevent siphon when the pump shuts off. Also, keep it away from the ATO internal monitor.

Suitable for Transparent Tank Wall

Since the monitors are built with optical sensors, they only work for tanks with transparent wall. Tanks with opaque wall is not suitable for this water refiller tool. As long as the tank wall is transparent, no matter it is reef aquarium, saltwater aquarium, or freshwater aquarium, the water refiller will be working.