- Improved thicker design: 3.8cm thick
- Self-supporting, form-stable, firm and rigid
- NEVER needs replacing! Will last a lifetime!
- The open, highly aerobic tri-dimensional structure promotes healthy water conditions
- Only available from Cz Garden Supply (TM), USPTO and Amazon Brand Registry Protected
****Purchase includes 1 filter mat.*** 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.