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https://www.swelluk.com:443/fluval-sea-evo-52l-foam-filter/ 
Fluval SEA Evo 52L Foam Filter
Replacement filter media foam block for the Fluval EVO 52l Tank, already at the perfect size for the built-in filtration system.
Product Information
This replacement foam filter block for the Fluval Sea EVO 52l can also be used with the Fluval Spec 60l aquarium as well. This block is custom designed to fit perfectly into the filter of these tanks, with gaps for other media, such as carbon or biomax media, adding a level of chemical and biological filtration to the system, making it more efficient in keeping your tank clean.
These blocks should be replaced about every 6 months or so, or more often if required. Regular light cleaning will help to prolong their lifespan and ensure the are at their most efficient.