Ultrapure & Industrial Services reverse osmosis units are designed and manufactured for sea water applications. They are horizontal configurations utilizing horizontal high-rpm centrifugal pumps. They are pre-engineered, pre-assembled units that minimize installation and start-up costs. They are fully tested at the factory and require simple utility connections and with minor set up and adjustment are ready for immediate on-line service. Their simple designs maximize reliability of the Reverse Osmosis unit. Each unit is a single pass RO system mounted on a polyurethane coated structural steel frame. The RO unit includes a high pressure feed pump, FRP, side entry pressure vessels, spiral wound thin film composite RO membranes, PVC low pressure feed piping, stainless high pressure piping, PVC reject and recycle piping, PVC product piping, and a programmable logic controller.