It also allows
...Simple & ideal for the budding fish keeper.
Tank
Size: 30-60l Pump output: 150-300 l/h
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...Eheim Mech Pro Mechanical Filter Media with Spiral Shape (1litre) has a Spiral Shape to trap even the smallest of particles. It also allows colonisation of bacteria which break down toxins & this ensures additional biological filtration. Use in the Eheim range of internal filters. Changing your filter media regularly can extend time between cleaning & make sure that your fish are enjoying the most sanitary environment.1litre size.