fluid 16 alternatively or at the same time paint overspray 20 may also be entrained within bulk fluid 16 in a known manner exemplified by a fluidized curtain 15 and then supplied to pan s 18 whereby the bulk fluid 16 is then drained into plenum 14 and about packing 22 contact material 22 is packed in a density determined iteratively or otherwise by the respective design criteria of the particular painting operation and the bulk fluid paint overspray treatment system fig2 illustrates various types of packing or contact material 22 and various shapes of packing 22 thereby enabling tailoring of the total surface area and of the total interstitial area defined by the packing 22 within the packed plenum 14 in general the packing 22 is preferably non sorbent or moderately sorbent thereby inhibiting saturation of the packing with the bulk fluid 16 employed referring now to fig3 6 a paint spray booth as described herein may be provided with a dispersion mechanism to enable dispersion of bulk fluid 16 along an exposed entry surface 22 a of bulk fluid 16 into packing material 22 such that a portion of the bulk fluid enters each exposed portion of the packing material surface 22 a within a particular timed interval at least once per minute for example this helps ensure that substantially an entire fluid entry surface 22 a of the packing material 22 is sufficiently rinsed of paint particles received from the forced airstream this in turn aids in preventing obstruction of the entry passages into the packing material matrix by accumulated unrinsed paint particles such obstruction of the packing material entry passages may increase resistance to airflow through the passages.