Auto Top Off Units
What are ATO units ? Naturally water evaporates and with saltwater aquariums only the water evaporates leaving behind salt. Day by day without top up of fresh water the salinity in your aquarium will rise. The special units found below automatically compensate for evaporation by adding fresh water back into your aquarium. They work with a sensor and pump. The sensors tells the pump with its dry signaling evaporation and the pump which sits in a fresh reservoir pumps it back into the tank.
Increase aquarium consistency and control salinity swing with these.
