Fluval Foam Filter Block (204/205/306 & 304/305/306)- 2-Pack Go to amazon.com Related posts 10 best fish tank filter sponge fluval for 2022 FeatureProvides mechanical filteration of large particlesPrevents premature cloggingEnhances biological filtration2-pack; Suitable for Fluval 204/205, 206/306 and 304/305 Filters
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