Each plate is injection-moulded from glass-filled polypropylene then CNC-milled for ±0.1 mm flatness, ensuring zero bypass under 25 bar squeeze pressure. A computer-optimised ribbed drainage grid accelerates filtrate evacuation by 30 % versus drilled ports, while integrated lifting lugs allow two-person handling without cranes. Optional ceramic face sheets extend wear life beyond 8 000 cycles in iron-ore or coal slurries.