Juwel Compact Carbon Filter Pad
2 x active carbon sponges clean the water of all chemical impurities by absorbing them in its active carbon. These chemcial impurities will not then effect the bacteria- cultures inside the blue sponges. If the carbon sponge is left in the filter too long, it can release the chemicals again into the water. Juwel therefore recommend to replace the carbon sponge every 4 weeks.