Great idea! While I don't have this filtration system, I bought two battery operated gravel vacuums that I used to pick up debris from the sand, and they only came with one filter. First one was cloth, but the second was a flimsy thin net, that was very good a filtration, but not durable. Ripped, so I had to order more, but if I could just find the material that would resolve the problem as many of us can fashion filters be it sewing or other means. I also have a fresh water 5 gal that takes those pre-packaged (charcoal) filter that are expensive. I took one and cut it and emptied the charcoal and replaced with a blend of charcoal and ammo chips. Worked great, but can't always clean well, but has held up. That boat seat fiber seems to be what I'm looking for. I saved the picture of the filter "felt" material, so I can know what to look for. Thanks again.