NOVELTY - Non-fresh water (1) is converted into steam. Steam is subjected to high-temperature electrolysis (5), and the produced hydrogen gas (8B) and oxygen gas are separated. The hydrogen gas is combusted with oxygen gas (7B) to produce superheated steam, and the superheated steam produced by combustion is collected.    USE - Rosenbaum-Weisz conversion of non-fresh water e.g. seawater, brackish water, wastewater, polluted water, and water from source chosen from water from oil and gas production, flowback water from fracking, water production from tar sands, water from chemical/industrial/processing plants, and water from mining/foundries operations and oil spillage, to steam or fresh water (all claimed). Uses include but are not limited to water used for drinking, food preparation, bathing, washing clothes and dishes, flushing toilets, watering lawns and garden, fresh water for use in hotels, restaurants, office, and civilian and military institutions, industrial water used for processing, cleaning, dilution and cooling in steel, paper, chemical and petroleum-refining industries, water used for stock animals, feed lots, and fish farms, water used for production of red meat, poultry, eggs, milk, and wool, and water used in production of electricity in thermoelectric power plants fueled by fossil fuels and nuclear fission, irrigation water for farms, orchards, pasture, and horticultural crops, and water used for freeze protection, crop cooling, chemical application, and harvesting.    ADVANTAGE - The method involves combustion of hydrogen and oxygen at elevated high pressure, which prevents air from entering the combustor, thus preventing the creation of nitrous oxide which might otherwise be created as a result of the high temperature created by combustion. The heat from high-pressure high-temperature superheated steam is then removed by a high-temperature heat exchanger system and recycled back to the high-temperature electrolysis unit. The process can be utilized by both rich and poor nations across the world since it requires very little purchase of external energy to operate.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) system used for the conversion process; and    (2) high-temperature electrolysis unit.    DESCRIPTION OF DRAWING(S) - The drawing shows a flowchart of the process in high-temperature electrolysis of non-fresh water producing fresh water.    Non-fresh water (1)    High-temperature electrolysis (5)    Oxygen gas (7B)    Hydrogen gas (8B)    Fresh water (12)