Koolermax AR-122 6-stage RO+DI Aquarium Reef RO system 80 to 120 GPD New complete Koolermax 6-stage RO+DO Aquarium Reef water RO system, 120GPD The system come with RO unit, pressure gauge, all filters, installation hardware Include a auto-shut-off valve, so when output is closed, the input will be turn off pressure gauge included, reads operating pressure and know when to replace the bottom 3 filters Assembled in USA with NSF and FDA approved components