Large internal filters with Triple-Action filter cartridges. The first cartridge is filled with Filter foam and Activated Carbon. This cartridge has to be replaced every month. The second cartridge is filled with CrystalMax, a very porous biological filter medium made from sintered glass. It acts as a sponge for micro-organisms, decomposes waste products and harmful substances very fast and effectively.
Perfect filtration for tropical and coldwater aquariums.
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