All-purpose brush for cleaning all types of casing and screen, including PVC! Unique design: agitates, surges and scrubs simultaneously! Self-cleaning: scale particles flush out of the brush! Attaches to cable or pipe. Floating brush design virtually eliminates “hanging up” inside casing! Interchangeable brush design; select brush size to match the casing! Durable, holds its shape better than conventional steel-bristled brushes. Heavy-duty bristles of the highest quality polypropylene. For best results, use with Cotey’s well cleaning chemicals.