text: Special types of tube cleaning are all such types which are partly in experimental stage only and do not come under the process types mentioned before, such as, for example:
  * induction of water hammers, so that the layer or deposit comes off through short-term material elongation
  * use of vibration generators, partly at the tubes through vibration exciters, partly by means of piezoelectric crystals in the conveying medium, in order to transform the conveying medium into a cleaning medium through reduction of the surface tension
  * magnetic fields to avoid tube calcification
  * nanotechnical treatment of tube surfaces to avoid layers and deposits