Yeah, the Duda Diesel Felt. I use a staging of 5 micron felt on top, a roll about 1" wide of 5 micron, the same for 1 micron under that, and a 1 micron disc over the filter plate. Works great as a depth filter, however I’ve had no need to run media because I extracted what I grew. I felt the depth filtration was enough, and I chose to forgo on the media.
If you go to buy the felt, you can order it off of Amazon. The shipping was dramatically different for me where I’m at going through Amazon