Clarke CA90 32T Disc Walk Behind Scrubber has high capacity 30 gallon tanks, manual switch controls, powerful downpressure, and the ability to scrub floor or even grind concrete. This is a no-frills machine that is intended to handle large jobs efficiently. The Clarke CA90 is a 32" disc style floor scrubber with a productivity of 34,560 sq ft/hr based off of the standard 36 volt 250 ah battery configuration.