The Neptune System Flow Sensor is a precision monitoring device designed to measure real-time water flow in aquarium plumbing lines, ensuring accurate performance tracking of return pumps, reactors, and filtration systems. Compatible with the Apex aquarium controller, this sensor provides detailed flow data that helps aquarists identify blockages, pump inefficiencies, and system changes before they impact water quality. Its robust construction and reliable sensors deliver consistent readings, allowing for improved system optimisation and enhanced stability in both freshwater and marine tanks. Easy to install and integrate, the Neptune System Flow Sensor offers advanced monitoring capabilities that support a healthier and more efficient aquarium environment.