Hydros Triple Optical ATO Kit The Hydros Triple Optical ATO Kit is a HYDROS auto top-off package for maintaining stable aquarium water level in freshwater, saltwater, reef, sump, and all-in-one aquarium systems. It uses a triple optical water level sensor, a HYDROS DC Micro Pump, tubing, and a siphon break to help automate freshwater replacement as evaporation lowers the aquarium or sump water level. HYDROS Triple Optical ATO Kit Overview This kit is designed for aquarium owners who want to use a compatible HYDROS Control device as an auto top-off system instead of adding a separate standalone ATO controller. The triple optical sensor adds a higher level of safety than a basic single-sensor setup by giving the HYDROS system multiple water-level reference points for fill control and protection. It is especially useful for small aquariums, all-in-one systems, sumps, and reef aquariums where stable salinity depends on consistent freshwater top-off. Triple Optical ATO Features Triple optical water level sensor helps provide added safety for auto top-off control. Designed to work with compatible HYDROS Control devices using Sense Port and Drive Port connections. Helps maintain stable water level and reduce salinity swings caused by evaporation in saltwater systems. Optical sensor design has no moving float arm to stick or fail mechanically. Included DC Micro Pump connects to a compatible HYDROS Drive Port for controlled top-off operation. Suitable for small aquariums, all-in-one tanks, sump return chambers, and lower-fluctuation ATO applications. HYDROS app configuration allows alerts and control logic to be managed through the controller ecosystem. Hydros Triple Optical ATO Kit Specifications Product type: HYDROS auto top-off kit UPC: 6974415980452 Part number: HDRS-ATO-300 Sensor type: Triple optical water level sensor Tubing length: 80 in Tubing size: 8.5 mm OD x 6.5 mm ID Pump type: HYDROS DC Micro Pump Connection requirements: HYDROS Sense Port and HYDROS Drive Port Application: Aquarium auto top-off for compatible HYDROS systems ATO Compatibility and Application Notes The Hydros Triple Optical ATO Kit requires a compatible HYDROS Control device with the needed Sense Port and Drive Port connections. It is best used where a small DC top-off pump is appropriate for the reservoir and aquarium layout. Confirm pump placement, tubing route, siphon break position, and sensor location before relying on the system for daily top-off. Official HYDROS Auto Top-Off Video Setting Up the HYDROS Triple Optical ATO Kit Install the water level sensor at the desired operating level, place the DC Micro Pump in the freshwater reservoir, route the tubing securely to the aquarium or sump, and install the siphon break as needed to prevent unwanted back-siphoning. Connect the sensor to a HYDROS Sense Port and the pump to a HYDROS Drive Port, then configure the ATO input, output, alerts, and safety limits in the HYDROS app before leaving the system unattended. What's Included 1 x HYDROS Triple Water Level Sensor 1 x HYDROS DC Micro Pump 1 x Hang-On Tubing Mount 1 x 80 in Tubing 1 x Siphon Break
