This Product has now been discontinued and there is limited stock available. Brintons MMC-PRO generally kills green/black mould and algae in 2-4 days. Applied at low pressure and allowed to soak into the surface, it makes aggressive application unnecessary. Bleach and acid-free, its high-performance formula protects all hard surfaces for up to a year. Before buying, we recommend that all customers read our Product Guide in the Product Information section.