I bought a little electric Pressure washer from amazon for $99 and ot works great. Has an adjustable tip so You can make a big fan and it gets Crud out the hose wontI dont recommend everyone or even anyone do what I do ... but I'll just what my experience is for cleaning cartridge filters.
I know everyone and all the literature says not to, but I use pressure washer at the car wash on mine. I just stand back far enough so as to be sure that I dont hit it with too much pressure and damage them. Works like a charm and I have all 4 of them done in 10 minutes. I started doing this because my water pressure from the tap is only about 50psi and it took a couple hours and didnt to a good job of cleaning them. Going on year 6 with the same filters now, so Im happy!