Sera Crystal Clear Professional, Pack of 12, .07 LB
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The innovative, patented 3D fiber structure of sera crystal clear Professional very quickly removes even smallest particles above 10 um (such as floating algae or sludge). Unlike common filter wool, the filter balls keep their shape and can be washed out several times, they are 80% reusable after washing out. The high performance filter medium is suitable for both freshwater and marine aquariums and all filter types.