EHEIM substrat pro: Bio filter medium for best biological decomposition efficiency. After the mechanical treatment of the water by EHEIM Mech, substrat pro offers perfect colonization conditions to the important purification bacteria through the high bulk density of the spherical shape (full utilization of the volume) and the perfect surface structure (maximum number of bacteria on each sphere). This combination provides the maximum number of purification bacteria which ensure clear, healthy water, stable water values and longer service life of the filter. substrat pro reduces the peak nitrite loads better, can be rinsed out and can be used several times.
Available as 250ml, 1 litre, 2 litres and 5 litres.