A special and highly concentrated water base formula, for the widespread and long term control of moss, mould and lichen on tile roofs (concrete & decramastic), concrete and masonry surfaces. The aqueous solution is highly surface active and will rapidly wet surfaces giving rapid penetration of the active material. It has strong residual properties, which inhibit regrowth over varying time spans. It is designed to ensure all fungi and algae spores are killed to produce a sterile substrate for coating. Primarily designed for long-term moss, mould and lichen control and for assisting in the cleansing and preparation of the roof prior to the application of the coating system.