Abstract: The invention relates to a system for producing an injection silicate gel solution for injection into a soil, comprising a filtering device through which a mixing water can flow for pretreatment, wherein the filtering device comprises at least one filter element for ion exchange, an admixing device for metered admixing of a curing agent, a feeding device for feeding liquid silica sol into the pretreated mixing water, a feeding device for feeding liquid sodium silicate into the pretreated mixing water, and a mixing device for mixing and homogenizing the fed components with the pretreated mixing water for forming an injection silicate gel solution.