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Fluval 404 / 405 / 406 Foam Prefilter Block 2 Pack (Four Blocks Per Filter)
Fluval Foam Inserts capture large particles 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.
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