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 antimicrobial 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 1l bottle concentrate will make up to 10l of stone cleaner c