A method for static mixing in a waste water settling tank to increase recovery of entrained solids and solvated materials, the method comprising delivering an influent stream at a substantially constant flow rate to a settling tank; discharging a first portion of said influent stream toward a fluid deflector and a second portion of the influent stream into a fluid containment assembly to distribute the influent into contact with previously introduced waste water to create mixing zones and cause coalescence of the entrained solids.