It has a microfibre pad instead of a brush, hence, it is a great alternative tool for window washing. Microfibre cleans more effectively than brushes do. It creates a plane of water hence no water droplets left to dry on the window. It can be used with pure water or tap water. The available sizes for this waterfed scrubber are 14″ & 18″. Use replaceable blue microfibre pad. Recommended use: high windows, walls, glass swimming pool fences, truck curtains, floors.