100 Micron Filter Socks
 

I have some 4"x14" 100 micron filter socks for sale. Perfect for you sump! Made from from polyester felt with a 4" plastic ring on the inlet. I use these on my reef tank and rinse them out every 4 days or so as they do trap a lot of detritis, great for polishing the water! $10 each plus actual shipping. PM me for info.