I just bought a pair of some High Flow acrylic filter socks from a company in the UK, and they work amazing! Here is a shot of the bottom and the side of what these acrylic filter socks look like. They will drop right in your 4'' hole in your sump. They slide right in where you would original install your filter socks at on your sump. Filter socks are now the thing of the past. No more buying new socks every month, no more washing them in our washing machine with bleach etc, etc. Ones i Get them in I will install my pair of DreamBox - Silencer // Filter socks inlay so you don't hear any type of water going down the socks..
acrylic filter socks
acrylic filter socks
Dreambox-Silencer // Filter socks - inlay
My custom made sump 36x15''
Others have asked and I would like to know who you got those from as well. I wonder if they will ship to the US as those look nice.