12 x Compatible Tetra EasyCrystal C250/300 FilterBox Filter Pack Replacement Carbon FiltersUpgrade your aquarium’s filtration system with our Compatible Tetra EasyCrystal C250/300 Cartridge Filter Packs. Designed specifically to fit Tetra EasyCrystal Filter 250 and the EasyCrystal FilterBox 300 models, these high-efficiency filter packs ensure crystal-clear water and a healthy environment for your aquatic life.Designed for durability, these filters maintain high filtration efficiency over extended periods, reducing the need for frequent replacements. Available in convenient multi-pack options to suit your maintenance needs, providing an economical and reliable solution for your aquarium care.Whether you're an experienced aquarist or just starting, maintaining the health of your aquarium is essential. Our compatible Tetra EasyCrystal C250/300 filter packs offer enhanced durability and performance, giving you peace of mind and more time to enjoy your vibrant aquatic world.Intensive mechanical and biological filtration. Mechanical filtering: Double layer filter fleece for reliable removal of even the smallest suspended particles. White side = coarse pre-filter, green side = fine filter DirectionsWhite side = coarse pre-filter, green side = fine filter.