The 10" Stainless Steel Bristle Algae Brush is built for heavy-duty cleaning of concrete and plaster pools, especially when dealing with black algae, mineral stains, or calcium buildup. Its stainless steel bristles provide aggressive scrubbing power that penetrates deep into porous surfaces where stubborn growth thrives. The compact 10” design allows for precise control in tight corners, steps, and around fixtures, making it an essential tool for pool maintenance.