Bulk Reef Supply 4 Stage Value Plus 75GPD RO/DI System is designed for reefers who have chlorinated water or relatively clean well water. It's ideal for tight spaces and offers easy installation with no permanent modifications required. Key features include a dual TDS meter, pressure gauge, automatic shut-off valve, and pre-installed filters, all backed by a lifetime warranty. The system effectively delivers purified water suitable for various aquariums, whether saltwater or freshwater.