In short: The Gentle Duty Brush is a tool for spray coating preparations, gentle descaling and even chimney cleaning. The bristles on the brush are manufactured from Silicon Carbide that offers the much needed roughness for those cleaning operations where chains are a bit too much, but Nylon Brushes don't quite cut it either. With the Gentle Duty Brush you can roughen up PVC pipes prior to spray coating or brush coating effortlessly. Commonly these brushes are used before using Spraypoxy spray coating systems, Picote Brush coating systems or the Picote Inversion Cannon. The gentle duty brush also effectively gets rid of light scale in drains while still being extremely gentle to the pipe itself, this makes the gentle duty brush an excellent choice when dealing with light scale in PVC, fragile or poor condition hard metal pipes.