The Red Sea Auto Top-Off (ATO) system automatically replaces evaporated water to maintain stable salinity in your reef aquarium. Features a reliable optical sensor with dual fail-safe protection to prevent flooding. WiFi-enabled with ReefBeat app integration for remote monitoring and alerts. Easy installation in Red Sea REEFER and MAX sump compartments. Authorized Red Sea dealer — full manufacturer warranty included. Available at Rift 2 Reef Aquatics in Highland Village, TX.
