Japanese Matting, probably, in our opinion, one of the best of all the filtration media which is available in the UK today ..
Japanese Matting is extremely inert and easy to service, Japanese Matting is available in sheet form and can be cut to the desired sizes to fit your filter chamber by using an Angle Grinder or better still an ordinary Circular Saw but be careful and wear protective glasses and watch those fingers unlike the fins on our Koi fingers don't grow again.