The S&P ARMO Power Pump has been developed specially for the S&P ARMO-crete w (wet sprayed mortar). The pump can be fed directly from a silo or from bags of material. The patented after-mixer guarantees, that the mortar's required mixing time is observed. The water column ensures a constant addition of water. This means, moreover, savings in labour costs for the "silo company" and an elimination of dust generation.