Industrial reverse osmosis systems from Horizon Engineers of La Habra, Calif., are especially designed for the medium-size user, with pre-designed packaged units from 3-to-300 gal/min (4,000-to-400,000 gal/day). These industrial designed units are assembled on a steel skid with electrical control panel, and can be used on any application. Pre-treatment options include media filters, carbon filters, softeners and chemical feed. Post-treatment options available are sterilization, decarbonators, re-pressurization and polish deionization.