With CrystalMax you acheive the best performance per litre of filter volume!
It is extremely porous filter media made from sintered glass with unique characteristics. Extremely large colonised area for micro-organisms (275msq per litre of CrystalMax).
Gives a quick filter start-up, CrystalMax acts like a sponge for micro-organisms. Harmful substances will decompose due to the aerobic (high oxygen) and anaerobic (low oxygen) filter processes.
Comes with a free filter bag for simple handling and cleaning of the CrystalMax.