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https://www.swelluk.com:443/aquarium-systems-poly-media/ 
Aquarium Systems Poly Media
Aquarium Systems Poly Media is a versatile filter medium that acts as both mechanical and chemical filtration by absorbing chemicals and pollutants from the water, as well as sieving out fine particles.
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Product Information
Poly Media is a unique invention for chemically filtering and purifying both fresh and saltwater. A special patented material bonded to a synthetic matrix, allows Poly Media to absorb contaminants and other toxic materials found in nature or which are introduced to fresh and saltwater aquariums.
Available in 3 sizes; Twin Disks, 20cm x 10cm & 30cm x 30cm, can easily be cut down to fit sumps, internal and external filters.
Poly Media Benefits:- Can be cut to fit any size of filter.
- Changes colour to indicate the type of materials removed.
- Non-Toxic, manufactured specifically for aquarium use.
- Guaranteed to remove copper based medications from seawater.
- Will not release impurities back into the water.
- Will not remove trace elements from solution as it is pre-saturated at seawater levels.
- Suitable for fresh and saltwater aquariums.
- Chemically filters and purifies water.
- Unique filter media which changes colour to identify toxic problem.