Fluval Foam Inserts, split for convenience, come packaged for each size Fluval Filter. The construction of the foam inserts allows plentiful bacterial populations for biological action. Abundant pores in the foam provide multiple attachment points for bacteria. Porous construction also enhances mechanical removal of smaller wastes missed by lower modules. The numerous pathways that the water is forced to travel as it flows through the block also increase the filtering efficiency. The actual area the water must travel through can be greater than ten times the measurable volume of the foam block. Although not permanent, the sponge inserts can be rinsed and reused a number of times before replacement. Fluval Foam should always be placed in the top module closest to the Impeller system. Besides the massive biological area, the foam protects the impeller from particles and threads passing into the impeller well and binding the impeller and creating possible damage to the impeller or motor. The foam is split in half, so the lower half could be moved within the assorted modules, but it is highly recommended for the long term operation of the filter that at least the top of the upper module be filled with Fluval Foam.
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