Eshopps 300 Micron Filter Sock - 4 in. x 13.75 in.

I got these to help catch detritus as well as minimize the micro bubbles entering through the rest of my refugium and ultimately back to my main tank. They do a really good job! I have 1800GPH going through one bag. I have to pull the bag up over the PVC output otherwise water runs over the top, but otherwise this is great. I have 2 that I alternate/wash about weekly.

I order several of these for my sump/refugium and love them. They catch a lot of detritus and very easy cleaned. I toss my in the washing machine (no soap) and run it on a quick cycle and they come back out white and ready to go.

Good sock if you have the depth for them. Their good for at least a week befor needing to be swapped out.

Good sock at a great value,.