Photo 1 of Fluval U4 Filter Poly/Carbon Catridge (2 Pack) U Underwater BioMax Filter Biomax + Poly/Carbon Filters

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Photo 1 of Fluval U4 Filter Poly/Carbon Catridge (2 Pack) U Underwater BioMax Filter Biomax + Poly/Carbon FiltersPhoto 2 of Fluval U4 Filter Poly/Carbon Catridge (2 Pack) U Underwater BioMax Filter Biomax + Poly/Carbon Filters