An illustrative embodiment of a flow cell may include a main chamber, base plate, and cover. The main chamber may be formed with an interior portion having a first angled surface, a first ramp, a second ramp, and a second angled surface. A secondary drain may be positioned at a point of relatively low elevation between the bottom portions of the first and second ramps. The main chamber may include first, second, and third inlet passages that may be in fluid communication with an inlet header formed in the base plate. A PLC and/or PAC may be in communication with various components of the flow cell and/or external components for monitoring, sensing, and/or providing other functionality.