The AquaFX Creep Killer Dual Electronic Standard Finger Float is a sophisticated solenoid system designed to precisely manage water levels in your saltwater aquarium or reservoir. This essential controller actively combats "TDS Creep," a common issue where the Total Dissolved Solids in your top-off water gradually increase, compromising water quality and stability. By maintaining consistent parameters, it helps create a more stable and healthier environment for your delicate reef inhabitants. This top-of-the-line system features a dual high/low electronic finger float setup, ensuring accurate water level detection and control. It comes complete with a 110V plug for easy power connection, a durable 3/8" solenoid valve for reliable water flow management, and a robust relay box to house the electronics safely. A 3/8" bulkhead is also included for secure installation into your system, though some assembly is required to integrate it into your existing setup. This product is ideal for serious reef aquarists and enthusiasts who prioritize pristine water quality and wish to extend the lifespan of their RO/DI filtration systems. By preventing TDS creep and ensuring only pure water is added to the tank, it reduces the frequency of membrane and filter cartridge replacements. It's a vital tool for anyone seeking automated, precise control over their auto top-off or water change processes, guaranteeing a more stable and ultimately more successful reef aquarium.