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https://www.swelluk.com:443/oase-carbon-filter-media/ 
Oase Carbon Filter Media
The Oase filter carbon actively absorbs odours, organic pollutants, toxic compounds & medications. Order online today from Swell UK.
Product Information
The Oase Carbon Filter Media can be used with the FiltoSmart, FiltoSmart Thermo and BioCompact aquarium filters. It is advised to replace this every 8 week from your filter to ensure maximum efficiency.
It can adsorb much more impurities than standard filter carbon and most carbons on the market. It's important to remove carbon media when administering a treatment to ensure the best results.
Problems with algae are often caused by the release of phosphate from activated carbon with high POI (Phosphate Output Index) levels - often as high as 14.0, which inhibit lime synthesis in coralline algae, corals and other organisms that deposit lime.
Size: 260g (2 x 130g)