One of the best of all the filtration media for koi pond - very firm and rigid, sinking. Japanese filter mat is extremely inert and easy to service, available in sheet form and can be cut to the desired sizes to fit your filter chamber.
- Improved thicker design: 1.5" thick
- The best biological media available
- Very firm and rigid
- Never need to replace, sinking
- Dimensions: 40" x 20" x 1.5"