Eheim substrat pro 5 litre
Eheim substrat pro is a highly effective biological media containing living organismsr this type of filtration is the purification of the aquarium water by using living organisms such as denitrifying bacteria these desirable bacteria will attach themselves to all hard surfaces within the aquarium systemr they use the toxins as a food converting harmful toxins such as ammonia and nitrite into less harmful nitrate after prolonged use mechanical and chemical filter media will act in a biolog