The AquaFX Octopus RO/DI System 100GPD is an advanced, 4-stage water purification unit meticulously hand-built in the USA, designed to produce ultra-pure, 0 TDS laboratory-grade water for saltwater reef aquariums. It effectively removes harmful impurities, including phosphates, ensuring pristine conditions crucial for sensitive marine life. This system boasts a range of unique features for optimized performance and efficiency, including a booster pump with high and low-pressure sensors and an Auto Flush RO Controller. The controller not only extends the life of the RO membrane and DI cartridges by preventing TDS creep and scaling but also works with an adjustable flow restrictor to achieve an impressive 1:1 product-to-waste water ratio. Further enhancements include a built-in TDS meter for continuous monitoring, a glycerin-filled pressure gauge, quick-disconnect fittings, and a heavy-duty aluminum bracket. The AquaFX Octopus RO/DI system is perfectly suited for busy reef tank hobbyists seeking the highest level of automation and reliability in water purification. Its comprehensive suite of automated controls, including auto-flush and integrated TDS monitoring, minimizes the need for constant supervision while ensuring a consistent supply of zero-TDS water. This system delivers peace of mind, allowing users to maintain a healthy and vibrant reef environment with minimal effort.