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This particular type of cyanobacteria is responsible for creating black stains and streaks on roofs. [1] The bacteria accumulate over time as it feeds on moisture and calcium carbonate . [ 2 ] This accumulation begins to show the black stains as the cyanobacteria develop their dark and hard UV -protective outer coating.
The Asphalt Roofing Manufacturers Association (ARMA) recommends using a 50/50 solution of household strength sodium hypochlorite (pool chlorine) and water to remove moss and algae. [5] The addition of zinc strips near the roof's peak may reduce the regrowth of algae and moss. Zinc sulfate can also be applied on an annual basis.
Soft washing is a cleaning method using low pressure water. More recently, the term "softwashing" has been used to describe any form of spraying chemicals at buildings where solutions (typically sodium hypochlorite based softwashing chemicals) are used to remove mildew, bacteria, algae and other organic stains from roofs and other building exteriors.
An aerial photograph that allegedly showed "moss, mildew, algae, and mold" on their roof. But the picture, which appeared to be from Google Earth, showed "absolutely nothing!" Karen Hoover told ...
Audouinella, also known as black algae, [1] is a widespread genus of red algae, found in marine and freshwater environments. [ 2 ] The form known as " black brush algae " (or " black beard algae ", BBA for short) is a particular nuisance in aquaria , since most algae eater fish and invertebrates avoid it.
Samples from the Endeavour Hydrothermal Vents off the southwest coast of British Columbia showed that active venting black smokers had viral abundances from 1.45×10 5 to 9.90×10 7 per mL, with a drop-off in abundance found in the hydrothermal-vent plume (3.5×10 6 per mL) and outside the venting system (2.94×10 6 per mL).