Medium Intake Sponge
This is a coarse sponge for filter intakes. This bridges the gap between the small and large sponge filters. Working best on most mid sized hang on back filters. Half inch hole for filter intake. Can stretch a bit if needed. The hole goes all the way through this intake sponge. You can plug up one end with a piece of sponge or floss if your intake strainer isn't already plugged on the bottom.