This exclusive and advanced stone concentrate cleans away dirt, grime, algae, moss, grease and micro-organisms on stonework, brick walls, masonry, gravestones, garden ornaments, steps, drives, paths, patios, concrete and monuments. Once cleaned, it continues to have an anti-microbial effect which helps slow down the regrowth of unsightly algae, keeping your stonework looking pristine for longer thus minimising the amount of cleaning you need to do. One 1L bottle of concentrate will make up to 10L of stone cleaner (covers approx. 100m²).