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Fluval Filter Foam Pads are used with your U Series Filters. These foam blocks provide mechanical straining of particle waste and prevent the other filter media in the module stack from clogging. The basic concept of these blocks are mechanical but over time the pores in these foam blocks also become a biological filter.
Available as single pads for U1 filters and two-packs for U2, U3, and U4 Filters.
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