A cable release anchor having an improved breakaway post design with a cable release feature. Here, the first layer and the second layer are alternately disposed. The cross-sectional profile of the rail body includes a relatively flat top portion disposed between a substantially semi-circular front curved portion and a substantially quarter-circular rear curved portion. A two-way valve in the manifold is used to direct the dialysate flow through the blood circuit to prime the circuit for use in treatment. The array of containers and the bounded space are covered by a flexible fabric or rigid dome.