I recently decided to test out filter cups with filter pad instead of using filter socks. I got tired or washing and ordering new socks and figured I would give this a try. Attached are a few photos of what I bought so far. I tried both cups and ended up not using the Red Sea version because the rigidness of it made it hard to get in and out of the holder in my sump. The other cup was flexible and had some give to it which made it easier to remove for media changes. So far the filter pad is exhausting every two to three days. Just wanted to share my experience and see if anyone else had any tips or tricks to share !