Embodiments of the present invention address deficiencies of the art in respect to portal view rendering and provide a method, system and computer program product for managing portal page response times. The present invention provides a reconfigured manual valve including flow control structures to vary its standard functions. The process employs an adsorbent such as, but not limited to, carbon, silica, clay, zeolite or a metal silicate contained in a column to remove the impurities from fatty acid alkyl esters or crude biodiesel in a continuous process.