Poolmaster 10" Aluminum Backed Algae Brush w/Stainless Steel Bristles 20177 Keep algae stains at bay on your gunite pool with Poolmaster’s sturdy 10" Classic Aluminum-Back Algae Brush. Purpose-built for hard surface finishes, this rugged brush delivers deep cleaning power where you need it most. Key Features and Benefits Five rows of tough stainless steel bristles tackle stubborn algae stains and debris with ease. Designed exclusively for gunite, concrete, and hard-surface pools—never use on vinyl liner or fiberglass. Durable die-cast aluminum back and handle withstand frequent use and provide lasting strength. Ten-inch straight body makes scrubbing walls, floors, and tight corners more effective. Part of Poolmaster’s Classic Collection, ensuring superior quality and long-term value. Specifications Size: 10 inches Body Design: Straight Material: Die-cast aluminum back and handle Bristle Type: Stainless steel, five rows Application: For use only on gunite, concrete, and other hard pool surface finishes—not suitable for vinyl liner or fiberglass pools