Clean and healthy water: replacement foam cartridge for CristalProfi i40 and TekAir aquarium filters. Round cut with T-profile. Usage: inoculation with FilterStart. Usable for TekAir and CristalProfi i 40. Foam for optimal longevity: 25 ppi pores. Efficient mechanical and biological filtration. No release of harmful substances: 100% inert plastic to water. Included in the: 1 replacement foam cartridge.
