• The Filter Foam Set for the BioCompact 25 includes 2 full replacement filter sets
• Each set includes 3-stages of filtration for your filter Includes filter foam with fine active carbon
• Timing to replace the filter foam set varies upon aquarium size and the number of fish and plants

The Filter Foam Set for the BioCompact 25 includes two complete filter foam sets. Includes filter foam containing activated carbon. It is best to replace the filter foam set when you notice a decline in aquarium filter performance.