a method of inline mixing the exact amount of sodium silicate , catalyst and water to form a grout for injection into underground construction applications in order to eliminate waste of resources . the invention is comprised of a sodium silicate pump assembly and a water and catalyst pump assembly . a metering pump injects a catalyst into the water loop . the sodium silicate pump and the water and catalyst pump discharge lines are merged into one pipeline downstream . the single pipe is connected to a static inline mixer that ensures uniform mixing of all the components . the sodium silicate pump assembly and the water and catalyst pump assembly are hydraulically controlled . this allows an operator to vary the speed of the pump thereby controlling pump discharge .