We mainly manufacture and sell water treatment devices such as reverse osmosis water purification systems using reverse osmosis membranes for commercial use, flow-type ultraviolet sterilization devices, iron and manganese removal systems, and pure water production systems and ultra-pure water production systems using ion exchange resins. Additionally, we sell filters for impurity removal, such as filtration filters for water treatment, activated carbon filters, filters using ion exchange resins, and various special-purpose filters for iron removal, oil removal, and manganese removal. Furthermore, we also handle resin filter housings and stainless steel filter housings for filter cartridges, as well as various components.