Abstract: Machine dish washing process is invented wherein a detergent is supplied from a storage supply and is dispersed from at least one nozzle over crockery within the dish washing machine such that said crockery is washed with said detergent and said detergent is removed from said crockery thereafter, wherein said detergent is dispersed in a pulsating manner, e.g. said detergent leaves the nozzle as a pulsating flow. Preferably said pulse frequency is below 15 Hz, and during a single pulsating cycle, the dispensing rate changes e.g. from zero to maximum and back to zero.

Abstract: The invention relates to a filter for cleaning gases, provided with a quick-change coupling having an inlet and an outlet channel, and a hollow filter material housing filled with filter material through which, in operation, the gas to be cleaned flows. According to the invention, the filter material housing and the quick-change coupling are manufactured from materials that do not react with the gases to be cleaned and which do not release any substances during operation. The filter material housing may for instance be manufactured from glass and the quick-change coupling from stainless steel.