Rite Size E Filter Cartridges for MarineLand Power Filter: Replacement Aquarium Filter Cartridges compatible with Marineland Emperor PRO Power Filter 450 and Emperor Power Filters 280/400. Unit Size: 6.1*8.86 inches (Not included handle), ideal refill to keep your aquarium environment clean and health. Four-Stage Filtration: Dense dual-sided mesh, Better thickness provides better filtration, High quality plastic frame make water flow fully filter, Ultra-Activated carbon instead of ordinary carbon and also add processed zeolite, which can effectively filter and absorb impurities in the water to keep the clean water source and healthy growth environment. Excellent Filter Media-Nutshell Activated Carbon: Adopt Nutshell Activated Carbon which has developed pore structure, uniform pore distribution, adsorbs dissolved pollutants from water, improves water clarity and color, while also removing odors. Compare with others, Better to provide a healthy Aquatic environment for Fish and Plants. Filter Media-Processed Zeolite: Compared to crushed granule zeolite, our spherical zeolite is cleaner and more advanced, It can adsorb ammonia, heavy metals and other harmful components. Balance the PH value to achieve a stable water state. Improve the fertilization efficiency of aquatic plants, make your aquatic plants grow faster and healthier. Easy to Install: Rinse the filter cartridges under clean cool water to remove the surface dust, after rinsing, insert the cartridge into the flushing chamber and make sure the filter cartridge fits completely into the chamber, please replace it every 2 to 4 weeks to maintain a healthy water environment. (Depends on the aquarium enviroment) Rite-Size E Filter Cartridges for Marineland