grouting station with competitive price

Grouting work was applied widely in dam, slope protection, bridge etc. projects. Sometime just grouting cement slurry will ok, but sometime need grouting mortar, if so, will add sand when making mortar slurry. Because the colloidal mixer mixing speed of electric hose pump grouting station with competitive price isvery fast, 1500rpm. If add sand directly, the impeller will be wearing very quickly. So how to making mortar slurry and grouting.