1.PF-S Filter Cartridges Refill Compatible with Top Fin Filter: 16 Pack PF-S Replacement Aquarium Filter Cartridges compatible with Top Fin PF10 Power Filters. Unit Size: 5.5 3.1 inches (included handle, and 5.13 inch without handle), ideal refill to keep your aquarium environment clean and 2.Four-Stage Filtration: The filter is made of dense dual-sided mesh, Better thickness provides better filtration, Ultra-Activated carton instead of ordinary carton and also add processed zeolite, which can effectively filter and absorb impurities in the water to keep the clean water source and provide the y growth environment for fish 3.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 y Aquatic environment for Fish and Plants 4.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 ier