Kieselsol 701 is a classic horizontal barrier system for capillary water stop. Kieselsol 701 operates with two modes of action. Silification and hydrophobisation of pores and capillaries. In the same step, the material strengthens weak joint mortars. Kieselsol is a horizontal barrier, a surface hydrophobisation, a wonderful primer for plaster and paint and it strengthens the treated surfaces.