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Continuous digesters can be up to 200 feet tall and range in diameter from 12 to 18 feet. Chips and cooking liquor are delivered to the top. Excess liquor that was used to transport the chips is removed and the chips slowly move as a plug down the length of the digester over a period of several hours. Screened outlets along the outer wall of the digester allow liquor to be withdrawn at different elevations down the digester. A liquor distribution system, which consists of a set of concentric pipes extending down from the top of the digester, permits liquor to be introduced into the flow of chips at multiple elevations inside the digester.