Nilfisk-advance, Inc.

Nilfisk A/s

Nicholas J Graupe

Donald Joseph Legatt

A surface treating apparatus () includes a tank () containing a cleaning solution () supplied to a supply point (SP) via a fluid flow line () under control of a flow control module (). A chemical pump () controls flow of a chemical supplied to the fluid flow line (). A controller () controls the flow control module () to operate at an operating flow rate based on a level of the cleaning solution () sensed by a solution sensor (). The controller () controls the chemical pump () to operate at a flow rate based on the operating flow rate so that the chemical is supplied to the supply point (SP) at a selected chemical dilution ratio. An agitating element () agitates the surface with scrubbing pressure which is adjusted by the controller (). A spike button () is coupled to controller () and operable to momentarily increase the flow rate, chemical dilution ratio, and/or scrubbing pressure to remove unusually dirty spots.

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White Bear Lake, MN, United States of America

Nicholas J Graupe