About a 2 months ago i started to think how i can make my 180 gallon aquarium easier to maintain, filter socks were becoming a real pain, every 2 days take out old, replace, then clean, let dry. then all over again the next week. So i decided to come up with a way not to have to deal with the dreaded filter sock and came up with a roller filter that will be automatic.Put it together { took me three days to design and two days to build } installed on my tank and the results were unreal. I never would have realized how much the filter sock was letting get passed the fabric and these are 200 micron socks. the amount of stuff that my roller filter collects after every 12 hours is insane. My weekly chores on my tank have now become almost nothing except checking my water chemistry . i can finally enjoy looking at my tank instead of working on it.:):)