【Compatibility Of Desktop Aquarium filter media】 The Three-Stage Filtration Tank Filter Maintenance Kit is designed to be compatible with Fluval SPEC, EVO and FLEX Desktop Aquarium Series, Each Set Includes Carbon Filter Refills, Foam Filter & Ceramic Rings。 【Package Contents Of Filter Media】Our Desktop Aquarium filter Maintenance Kit package includes all necessary filter media, including 2 Carbon Filter Refills,2 Foam Filters A1376,2 Ceramic Rings,2 Filter Cord and 2 Cleaning Brushs. 【Easy Installation】The size standard for sponge filters can be matched with Desktop Aquarium.Installation is quick and easy,No special tools are required. 【Replacement Frequency】It is recommended to replace the Desktop Aquarium Filter Media kit Regular. Adjust the Filter Media replacement frequency according to the usage of each Desktop aquarium，ensuring your Desktop aquarium maintains optimal state. 【Upgraded Design Of Tank Filter for Desktop Aquarium Maintenance Kit】Ceramic ring's porous design boosts filtration. Reusable foam captures floating particles.Compared to traditional carbon filters, carbon sponge has a larger filtration volume, better water mobility, stronger adsorption capacity, and maintains the balance of Desktop aquarium.