A method, system and apparatus for processing a model-to-model transformation. A serial photonic signal comprising sets of synchronizing pulses and n sets of data pulses is received at the input of the demultiplexer. If the access indicator is associated with the instruction, a state of the access indicator is changed, by the processor, when the instruction is executed. The Maximum Irrigation Duration is adjusted by multiplying the Maximum Irrigation Duration by a Period Reduction Factor for the current period associated with the sector that has been identified by the user, to obtain an Actual Irrigation Duration. Provided that the uncompensated tilt angle of the beam is a and the angle of inclination of the cylindrical transducer in a particular direction is b, the tilt angle of the beam formed by a transducer array in the inclining direction should be adjusted to and the tilt angle of the beam formed by a transducer array in the opposite direction should be adjusted to. More particularly the present invention relates to such an improved dispenser for a tablet which according to one aspect of the invention is particularly useful with, or forms a part of a device for the treatment of water, particularly a device useful in the purification of water.