Stonecare4U Algae Remover is a professional surface cleaner that is highly effective for the removal of algae, moss, lichen, fungi, mould, bacteria & viruses on external hard surfaces. Essential Algae Remover’s unique formula is safe to use. Use annually for complete protection – where any algae and moss appears during the year, around downpipes and drains, treat locally. You do not need to retreat the whole area. Do not apply Stonecare4U Algae Remover when the threat of rain is imminent. Always try the product in an inconspicuous area prior to use. Extra caution is required when applying near or around fish ponds or similar. If you accidentally over-spray onto delicate plant life, rinse off with clean water.