Oase BioMaster Pre-filter Foam Carbon

• The 45ppi Carbon Pre-filter Foam Set for all BioMaster filters includes 6 carbon replacement filter foams
• Safely regulates the pH value and water hardiness
• Activated carbon absorbs unwanted substances in aquarium water
• Customize your choice of filter foams to meet the needs of your aquarium
• Carbon filter foams make replacement much simpler than common granular forms
• Timing to replace the pre-filter foam set varies upon aquarium size and the number of fish and plants 

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