i think the problem with any type of back flow cleaning is that the low pionts that collect the most debris as water flows thru from outside-going in, become the high points when you send water thru from inside-going out. most of the pressure would be cleaning the cleanest part of the filter.
i have always had good luck with plain old brass hose nozzle, turned to wide angle spray pattern. cleans away 90-95% of solid debris in less than 30 seconds, add some degreaser, let it sit and spray again......