I use nylon and have been changing between different micron ratings, 50 seem to clog up even when they look clean, and need washing almost daily. I think the 200 last about a week, but I also add filter wool (floss) inside the sock to improve clarity.
I think felt give better water quality (that's why I add floss to the nylon ones) but are much hard to clean, the nylon ones I just rinse under the sink and there good to go.
I think felt give better water quality (that's why I add floss to the nylon ones) but are much hard to clean, the nylon ones I just rinse under the sink and there good to go.