Eheim Ehfisubstrat Filter Media

Eheim Ehfisubstrat Biological Media is specially designed sintered glass with an enormous surface area of 450m2 per litre. Ideal for the colonisation of nitrifying bacteria. When changing the filter material, mix about 1/3 of the used medium with the new media to achieve rapid repopulation of the bacteria colonies. Eheim Ehfisubstrat may be washed with luke water water and be used several times. Before use rinse thoroughly.