Sometimes mistaken for mold, dirt or grime, these ugly black stains are a type of harmful algae that cause damage to the integrity of your roof over time. This windborne species of algae is known as “Gloeocapsa Magma”. Once these algae are present on your roof it can degrade the limestone filler within your asphalt shingles and create an ideal environment for other bacteria like mold, mildew, moss and lichen to thrive. Keystone Soft Wash uses a low-pressure application to apply their own proprietary blend to create an environmentally safe cleaning solution that will effectively and gently kill and remove the bacteria and restore your roof to its original shine!