Oase BioPlus Carbon Filter Foam 4 Pack

• The Carbon Filter Set 4 BioPlus for the BioPlus 50, 100, or 200 and BioPlus Thermo 50, 100, or 200 and includes four replacement activated carbon 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 filter foam set varies upon aquarium size and the number of fish and plants

What’s In the Box:  Four replacement activated carbon filter foams