Apparatus for counterflow rinsing of workpieces

In an apparatus for performing a counterflow liquid treatment of workpieces, the improvement comprising a framework for supporting workpieces at a stationary position at a treating station, nozzle means for applying a liquid to the surfaces of workpieces when disposed at the treating station, plural reservoirs including a first reservoir containing a first liquid and a second reservoir containing a second liquid, supply means for sequentially supplying said first liquid and thereafter said second liquid to said nozzle means for a prescribed time period, collecting means for recovering the liquid discharged from said nozzle means, drain means in said collecting means for returning the recovered said first liquid to said first reservoir and the recovered said second liquid to said reservoir, respectively;

• means for sequentially positioning said drain means in communication with said first reservoir and said second reservoir in coordinated relationship with the operation of said supply means, inlet means for introducing a selected quantity of fresh make-up liquid to said second reservoir, transfer means for transferring a portion of said second liquid to said first reservoir and in admixture with said first liquid therein, and outlet means in said first reservoir for discharging a portion of said first liquid from said first reservoir.