Blagdon Mini-Pond Carbon and Wool Replacement Filter PadsKeep your pond water clean, clear, and healthy with the Blagdon Mini Pond Carbon and Wool Replacement Filter Pads. Designed as a complete annual maintenance set for your filter, these high quality pads work as part of the 5 stage filtration system to ensure crystal clear water. The activated carbon pad removes odors, discoloration, and harmful chemicals, while the wool pad serves as a mechanical filter, capturing larger particles to maintain optimal