In accordance with DIN EN 14654, the following information is to be taken into consideration:

• Composition and extent of the deposits and agglomerations to be removed

• Nominal size, length and depth of the drain or sewer

• Material of the drain or sewer and its susceptibility towards damage caused in the cleaning process

• Structural condition of the drain or sewer and its susceptibility towards a change for the worse due to damage caused in the cleaning process

• Filling degree and flow conditions in the drain or sewer