Side walls 11 a, 11 b, front wall 17, and back wall 18 can be constructed of PFA, PVDF, HDPE, or other material which is chemically compatible with and resistant to the processing fluids that are introduced into processing chamber 19. [0036] Fluid inlet 14 is located at the bottom of processing chamber 19 and between the two upwardly angled walls 12 a, 12 b.