The single rack mechanical bar screen is automatic mechanical equipment specially designed for channels in wastewater treatment plant WWTP. The raw water filtration is carried out by an inclined wire rack collecting the waste. A single rake with teeth moved by a wire rope and gravity picks up the waste deposited on the screen. The waste is ejected by a scrapper at the top of the machine into a hopper then a dumpster. The single rack mechanical bar screen is fully automatic with timer Base Panel. Its Economic solution compare to the Multi rack Screen.