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"This nylon carpet scrubbing brush fits directly onto one of our 20\" rotary floor scrubbers, and is meant to be used with a machine that  has a 1.5 HP motor. The brush is equipped with two more aggressive outer rows of white bristles that scrub the carpet and break loose any dirt or debris. The inner rows of black bristles than follow behind and further work to break the dirt from the carpet strands. The inner carpet glide allows the brush to scrub consistently at the same height without digging too deeply into the carpet.This larger brush has showerfeed holes that allow you to use a shampoo tank with your floor buffer to directly dispense your carpet scrubbing solutions directly onto the carpeting. Many of our smaller brushes do not feature these showerfeed holes due to the small diameter of the block. Please take a look at our complete selection of carpet scrubbing brushes for different sizes and options.\r\nYou must break this brush in before using it on carpeting.  First remove the carpet glide, so you do not scratch this during the break-in procedure. Second, you need to run the brush on a concrete surface to remove any burrs, and to help soften up, or \"break-in\" the bristles. This helps the brush to work more easily on any type of carpeted surface."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.cleanfreak.com/equipment/floor/floor-supplies/brushes/buffer-brush/20-inch-carpet-scrubber-rotary-brush.html>