My setup started out with twin 100micron socks. I quickly learned that 100 micron is way to fine for primary, secondary and tertiary filtering.....so.....I changed my setup....300 flows to 200, to 100 and finally, lately, 50 microns. The whole filter bag system lasts me a month at 2000 gph.
Now....having said that, my water is crystal clear it's true, but I also had to change the way I fed the fish as well as how...
In the end, it all boiled down me just plain overfeeding the fish. Honestly, I went from twice a day to three times a week....sometimes only two. My fish became more active, more vibrant and voilà...filter socks suddenly NOT needing to be constantly cleaned.