I've had mine for 3-4 months now and I've always used the coarse mesh screen filter because that was the one it had installed out of the box. I was cleaning off the filter and realized there were a few small holes in the filter screens, so I decided to change them out. When I opened the extra filters it came with, I realized these were different and were "ultra fine filters." Haven't tried them out yet, but I'm pretty sure I am going to like these better because they will trap more dust/dirt (fine particles). Which ones do you guys mostly use? Trying to decide if I even want to buy another set of the coarse mesh screen filters.