Gravity hinge assembly which does not rely upon an axial rod or pintle to maintain axial alignment between the cam cylinders. Each compartment is sized to hold a plurality of blades in side-by-side relation. The measured information is displayed and incorporated in automated control of a GCIB processing system. The water treatment system is also provided in a modular arrangement wherein manifold heads are physically and fluidly coupled together via a clip which interfaces with the modular manifold heads.