Small sponges that we use on our canister filters intake that are shrimp safe. We recommend buying at least two of them so that you can swap them out immediately while cleaning. This will help so that shrimp does not swim into your canister while you are cleaning. We also recommend to swop them out weekly to avoid the sponges get clogged to quickly.
The sponge is open on one side and closed on the other.
7cm x 4cm.