Aquael Unimax 500/700 Sponge

These Aquael Unimax filter sponges are made of carefully selected phenol-free material. They ensure efficient mechanical water filtration by capturing impurities and suspended matter visible to the naked eye. At the same time, the sponges provide an excellent colonisation surface for nitrifying bacteria, which then perform biological filtration. The filter sponges should be exchanged regularly to generate an optimum of performance. The rinsing of the old sponges should only be Performed in water that has been drained from the tank in the course of water changes.