4 Inch Ring by 15 Inch Long Filter Socks 5 Micron - Aquarium Sump Pond Felt Fabric Filter Bag - 3 Pack (5 Micron)

The fabric and end weld are so stiff that I am unable to invert the sock for cleaning purposes. To be fair, my other filter socks are mesh style. Maybe it as a trait of all felt style socks that they can't be turned inside out.

Perfect — added to a sump pump and hose — as a temporary way to clean water from my stock tank pool! I cut off the ring and used an elastic band to secure to hose.