Tetra ReptoFilter Medium Disposable Filter Cartridges. ReptoFilter® disposable filter cartridges use dense, dual-sided mesh to catch debris and waste while the Ultra-activated carbon absorbs odors and discoloration. Ultra-activated carbon absorbs odors and discoloration Dense, dual-sided mesh catches debris and waste Convenient, pre-assembled and easy to use Fits: ReptoFilter 90GPH, Viquarium, and the Decorative ReptoFilter Size: 3 Pack