Filter socks are excellent at trapping floating particles in water to produce a crystal-clear aquarium. You’ll notice this style filter sock has a plastic ring around the top.
The ring is designed to fit in what's called a sump filter and the sump filter is usually found below an aquarium or close by. For a filter sock to work water from a display tank, comes down a pipe, goes in to our filter sock, flows through the sock, and into a sump where it is pumped back to the display aquarium.
Over time, our filters will become clogged with dirt and debris. To easily remove them from the filter, use the little handle inside the rim. The larger size socks sport 2 handles.