Fluval Foam Filter Block Fluval Foams capture large particles and debris for effective mechanical filtration, the crucial first stage in the filtration process. Custom fit to prevent bypass, they have a pore size that allows efficient water flow with less clogging for long-lasting filtration. These inserts also enhance biological filtration. For freshwater and marine environments. Available in 3 sizes: Fluval 104/105/106. Fluval 204/205/206/304/305/306. Fluval 404/405/406. Please select the required size from the drop-down menu.
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