Abstract: A waste polymer recycling process may include: (1) obtaining waste polymer (e.g., waste solution dyed carpet yarn); (2) pelletizing the waste polymer; (3) obtaining green and clear polymer; (4) providing an extrusion line that includes a dosing system, an extruder, a spinning machine, and a color sensor; (5) using the dosing system to dose a first amount of the pelletized waste polymer, a second amount of the green polymer (e.g., a second amount to offset a color of the first amount of the pelletized waste polymer), and a third amount of the clear polymer into the extruder; (6) forming the extruded polymer combination into carpet yarn using the spinning machine; (7) using the color sensor to determine a color of the carpet yarn and (8) using the dosing system to adjust at least one of the amount of pelletized waste polymer, green polymer, and/or clear polymer introduced into the extruder.