Bulk Reef Supply 4-Stage RO/DI System – Ideal for Reef Tanks and Clean Water The Bulk Reef Supply 4-Stage RO/DI system is the perfect solution for reef aquarium enthusiasts using chlorine-treated city water or clean well water. Designed with convenience in mind, this self-contained system is mounted on a single bracket, making it ideal for compact spaces or situations where a non-permanent water connection is needed. Installation is quick and easy, with no permanent modifications required to your plumbing. Key Features of the 4-Stage Plus RO/DI System: Dual TDS Meters: Monitor both incoming and outgoing water quality for precise control. Glycerin-Filled Pressure Gauge: Ensures accurate pressure readings for optimal filter performance. Pre-installed Automatic Shut-Off Valve: Automatically stops water flow when the storage tank is full, conserving water and energy. Pre-installed Flush Kit: Helps extend the life of the RO membrane by flushing out contaminants. Multiple Source Water Connections: Flexible setup for various water sources. Drain/Waste Water Connections: Easy installation of drain lines for waste water. Mur-lok Push Connect Dual EPDM O-Ring Fittings: Quick and secure tubing connections without tools. 10 Ft Tubing: Includes 1/4" blue, red, and black tubing for versatile installation. NSF Certified Filters: Only the highest-quality filters, certified for performance and safety. Why Choose Bulk Reef Supply 4-Stage RO/DI Systems? Bulk Reef Supply RO/DI systems are built with advanced reverse osmosis technology, designed to provide the purest water for reef tanks and other aquatic setups. Whether you have well water or city water, our systems are engineered to meet the unique needs of your aquarium. 4-Stage RO/DI: Ideal for city water with low chlorine or well water with minimal contaminants. 5-Stage RO/DI: Our most popular system for dealing with chlorine-treated city water or well water with moderate contaminants, including chloramines. 6-Stage RO/DI: For complex water conditions with high TDS or hard-to-remove contaminants like phosphates, nitrates, and silicates. Dual DI stages ensure comprehensive filtration. 4 Stages of Filtration: Stage 1 – 5 Micron Sediment Filter: Traps debris and larger particles, protecting your carbon and membrane filters. Lasts longer due to its graded density, offering superior performance. Stage 2 – 5 Micron VOC Block: Specially formulated to remove chlorine and volatile organic compounds, ensuring cleaner water. Stage 3 – 75 GPD Dow Filmtec Membrane: Industry-leading RO membrane with up to 99% contaminant removal. Operates efficiently with just 50 PSI of feed pressure. Stage 4 – Color-Changing Deionization Resin: Polishes water to 0 TDS, with a color-changing indicator (from blue to gold) to show when resin replacement is needed. Perfect for Aquariums: Whether you're setting up a reef tank or freshwater aquarium, our RO/DI systems provide the pure water needed for healthy aquatic environments. Choose the right system based on your water quality and filtration needs!