Fuente: WIPO "tomato" A fluid treatment apparatus (10) for treating a fluid for subsequent use as a growing medium or water source in agriculture or algaculture, as an electrolyte in an electrolyser in the production of hydrogen, and/or as a hydrocarbon-based fuel in internal combustion engines, the apparatus comprising a coil of electrically conductive material (100); a fluid flow pipe (40) arranged to carry a fluid through a passage through the centre of the coil (100); and an electrical supply (130) configured to supply a time-varying voltage of a given form between a first and a second end of the coil.