The Koolermax AR-122 6-stage RO+DI Aquarium Reef Reverse Osmosis Water System is a complete water system that includes everything you need to get started with fishkeeping. With a 150GPD RO membrane and 120 gallon per day generation rate, this system is designed for use with high quality water supplies. The system comes complete with all filters, tubing, instruction, under sink installation hardware and an extra garden hose adapter.