In the currently valid DWA-A 147, there is no reference to specific intervals of cleaning. Only intervals of inspections are specified. The set of standards from 2005 stated that the effects on the operation of treatment works or water pollution control have to be taken into consideration. Experience has shown that cleaning intervals can be set between 2/year and 0.1/year. In favourable discharge conditions without deposits it is also possible to do without cleaning. In case of smaller profiles up to about DN 800 (32 in) a localized determination of cleaning intervals can be practical [[DWAA147:2005]].
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