The unique composition formula of Essential Algae Remover is completely biodegradable and safe to use. Extremely effective at removing algae, moss, lichen, fungi, mould, bacteria, and viruses from external hard surfaces. Use annually for complete protection – treat locally wherever algae and moss appear during the year, such as around downpipes and drains. You do not have to retreat the entire area. When the approximate coverage is 100m2 per 5L, use undiluted on heavily contaminated areas or up to 1:20 dilution (low contamination). Then, depending on the surface contamination and method of application, the coverage area will vary. Available in 5L and 25L.