A filtration system is essential in order to keep your fish tank running smoothly. Without it, the filter is unable to do its job and can't collect bacteria and debris from the aquarium. Waste and tiny particles are taken out of the water and collected in the three types of filter media - biological, chemical and mechanical.
Eheim have a range of different types of media and accessories to suit their filters. In different forms such as sponges, cartridges and balls of bacteria that all clean and purify the water leaving it healthy and balanced. Sponges, foams and cartridges must be cleaned in aquarium water when they are dirty, and reused. This retains good bacteria which benefits your fish tank.