on the constraints of the chemical reactions involved in the event that the above definitions or a description stated elsewhere in this application is inconsistent with a meaning explicit or implicit which is commonly used in a dictionary or stated in a source incorporated by reference into this application the application and the claim terms in particular are understood to be construed according to the definition or description in this application and not according to the common definition dictionary definition or the definition that was incorporated by reference in light of the above in the event that a term can only be understood if it is construed by a dictionary if the term is defined by the kirk othmer encyclopedia of chemical technology 5th edition 2005 published by wiley john amp sons inc this definition shall control how the term is to be defined in the claims referring now to fig1 there is shown at least one embodiment of a cassette 7 used to generate chlorine dioxide the cassette can be one of the apparatuses disclosed in u s pat no 6 869 517 with the same or different feed procedures the cassette comprises three chambers 1 2 and 3 the first chamber 1 and the third chamber 3 are at least partially filled with at least one cation exchange resin one of the first 1 or third 3 chambers may contain at least one cathode one of the first 1 or third 3 chambers may contain at least one anode in fluidic communication with the first and third chambers 1 3 is a second chamber 2 the second chamber comprises three regions 4 5.