In a method of decomposing partially fluorinated and perfluorinated surfactants which are, in particular, present in wastewater, sewage sludges and the like, the surfactant is present in solution or suspension and is electrolytically decomposed. One or more control bits are operable to modify the resistance of the variable resistor, and such modification is operable to modify the hysteresis width of the comparator. In addition, a pushing member may be coupled to the first spine and extend proximally therefrom. The magnetically orientating device is adapted to magnetically orientate the magnetic pigment flakes. Two pieces of wood are fixed into the bed support at intervals and the disc sleeves position matches with the guide pieces. The process comprises the steps of: incubating the tea material in an aqueous medium; subjecting the incubated tea material to evaporation to obtain aroma-laden vapours; and condensing the aroma-laden vapours to recover an aroma condensate comprising volatile aroma compounds.