Re: Question of the day - July 12
I use 2-200 micron mesh inside 2-200 micron felt socks. I did try 100 micron, but as teebone says, every 3-4 days they can be overflowing, and letting -everything- into your sump, so I went with a pre-post filter setup. The mesh are a lot easier to clean out snails, worms etc, and the felt seems to do a better job of the smaller particles. I just swap them out every week or so, with the pile of spares I have.
I do find that when I first started using them, I was filling them up every week, easy. Now that they've been running for 6 or months, they last a lot longer, even brand new ones (I get the BRS ones), so there must be a good long term reaction to the water from prolonged use. I don't think I'd run a system without them.