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The Thick Stock System or Stock Preparation System is responsible for delivering the proper amount of thick stock to the Thin Stock System. The Thin Stock System uses white water to dilute the stock to the proper consistency for cleaning, screening, and delivery to the headbox. The Thin Stock System can include one or more of these process steps. Arranged roughly in this order. Centrifugal cleaners to remove small dense contaminants from the stock. Deaerating equipment to remove air from the thin stock. Screens to remove contaminants that are larger than pulp fibers. And pulsation dampening equipment to remove any pressure pulsations in the stock flow to the headbox.