Jap Matt is a polyester based material , commonly used in Koi ponds it has since become ubiquitous throughout the aquarium industry.
To function most effectively Jap Matt should be cut to fit tightly in the mechanical section of your filter system.
Jap matt can be used in any type of filter but is most commonly used in Sumps and Canisters.
Jap matt functions as both a mechanical and biological method of filtration.
Jap Matt filter media is sold in 1000mm x 500mm lengths with a thickness of 40mm.