Ok get some polyfill from walmart or a craft store. Then put a bunch of that in the gray media basktets that set infront of the cartridges. This does a very good job of removing fine particles. You can wash it out as many times as you like. It will never go bad. But its so cheap I just throw it away.
Then take your cartridges and after the get a few weeks of age on them cut the bottom and pour out the carbon. Then you just spray them off when they get dirty.
I use my sprayer on the kitchen sink. And i have cartidges that are 3-4 yrs old. If the marineland brand cartridges fall apart after a few months, then you can buy knock-offs from ebay that hold up for years.
Or you can buy polyester quilting fabric in 1/4-3/8" thickness and sew that on to the plastic cartridge frames.
Also I never clean my filter media until the water starts to pour over the top of the cratridges. Hence when they clog. I do this because as they fill with dirt they trap smaller and smaller stuff.