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i was never a fan of putting anything in line that can clog and or restrict the flow of coolant while driving even if its a metal screen. the way i would flush it is after your done running your favorite treatment through the system(vinegar, cascade, coolant flush, exlax whatever flavor you like). back flush the radiator if desired, i then disconnect the hose from the upper radiator neck and make sure the stat (if applicablle)is removed also. install a fence pipe or similar into the hose and clamp tight. use a pipe thats long enough to extend over the front of vehicle past the bumper. open drain cock and put your garden hose into the fill neck to keep a constant flow of water going into the radiator while the car is running. the loosened crap will flow out of the pipe. if your system is real bad multiple flushes may be needed.