apparatus is disclosed where aqueous solutions of chemicals are added to fused non aqueous baths this is done by spraying the aqueous solution of the chemicals onto the surface of the fused bath in a fine spray causing the evaporation of the water application_number US 75976377 A description referring now to the drawing a fused chemical treatment main tank 10 is shown somewhat schematically adapted to treat the surface of metal for scale conditioning the tank 10 contains therein a fused essentially anhydrous chemical bath 12 which is maintained well above 100 u00b0 c in the fused state by any conventional heating means not shown a motor driven impeller 14 is provided to agitate the bath this is located in the region at which the addition of the chemical is to be made a main venting hood 16 is provided over the tank to collect fumes from the tank which are exhausted through exhaust duct 18 the associated processing equipment is not shown apparatus for supplying a liquid solution of make up chemicals includes a supply tank 20 in which is disposed an aqueous solution 22 of the make up chemical burners 24 may be supplied to control the temperature and prevent solidification a metering pump 26 is provided which pumps the solution 22 from the tank 20.