OSG Corp. Co., Ltd. engages in the manufacturing and sale of water products and purifying equipment. It operates through the following segments: Water-Related Equipment, Maintenance, Home & Office Delivery (HOD) and Others. The Water-Related Equipment segment provides water purifiers, ionizers, oxidizers, filters, and coolers. The Maintenance segment provides hollow fiber membrane and activated carbon cartridges, liquid electrolyte additives, and maintenance parts. The HOD segment delivers hot and cold mineral water to homes and offices. The Others segment provides home electronic medical equipment, health products and tools. The company was founded on August 29, 1970 and is headquartered in Osaka, Japan.