condition repeated transient pressure waves formed by the pulsating flow create alternating positive and negative pressure differentials at the collection ports 3 inducing a similar effect as mechanical vibration the pulsating flow condition fluidizes a greater portion of the solids blanket and draws more solids 2 into the collection manifold 1 in the preferred embodiment the pulse is created by repeated start and stop signals sent to the pump 9 the pump 9 is preferably an air lift pump with programmable controls and on off timers monitored by a control system on off cycles in the preferred embodiment are set at 5 second intervals repeated for 30 to 60 seconds while 5 second intervals are preferred it is known that the invention remains generally effective in a range of cycles from approximately 2 second intervals to approximately 10 second intervals the lower interval limit is presently fixed based on the known limits in existing control technology on air lift pump applications shorter intervals may also be effective if attainable through later developed technology throughout the range of cycle intervals the preferred cycling period is approximately 30 to 60 seconds to maintain the desired effect cycling periods are repeated in proportion to the solids generation rate at the manifold 1 high solids generation rates may dictate additional cycling as soon as 30 minutes after the prior cycling although it is preferred that repeat cycling is minimized to reduce the amount of waste produced during the process it is.