Using one or more injection hoses or an injection rod, the suspension is first mixed in a mixing system and then pumped into the borehole. This is done in the so-called contractor procedure from bottom to top.

This is to ensure that any groundwater present in the borehole is displaced upwards or sideways and the entire borehole is filled with a suspension of the same density. This density is controlled during the grouting process. The grouting is completed when the grouting suspension comes out of the borehole at the same density on the surface as it is pumped into the borehole.