These Carbon Pre-filter foams remove toxins and odors and improves water clarity prior to water entering the main body of the filter, reducing filter maintenance.  Activated Carbon helps to remove cloudy water, harmful metals, odors, tannins or other colors for clear, pure aquarium water. As a filter foam replacing activated carbon is much simpler than using common granular forms. These are replacement filter foams for the pre-filter of the BioMaster. To optimize your aquarium filtration OASE offers additional pre-filter foams (sold separately) to customize the BioMaster pre-filter. Timing to replace the pre-filter foam set varies upon aquarium size, number of fish and plants, and declines in filter performance. We recommend replacing the foams incrementally. The carbon Pre-filter Foam Set includes six pre-filter foams for the BioMaster Filter series. 45 ppi fine Pre-filter foams effectively remove debris prior to water entering the main body of the filter, reducing filter maintenance Optimize your BioMaster filtration by using these pre-filter foams based on your aquarium’s needs. Timing to replace the pre-filter foam set varies upon aquarium size, number of fish and plants, and declines in filter performance. We recommend replacing the foams incrementally. The 45 ppi foams are pre-filter foams for the BioMaster 250, BioMaster Thermo 250, BioMaster 350, BioMaster Thermo 350, BioMaster 600, and BioMaster Thermo 600 Â
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