Filter Cartridges for Aquarium Filtration: The PF-L Fish Tank Filter Cartridges is 6 inches in length and 4.5 inches in width, Compatible with Top Fin PF20, PF30, PF40 and PF75 Power Filters. Dedicated to the clarity of the water and the healthy environment of the fish. Easy Installation in a few seconds: First remove the used filter element, and then rinse the new filter element with clean water to remove the dust, and finally put the filter element completely into the filter chamber. Note that pls replace filter cartridge every 2-4 weeks to ensure fishes have clean environment all the time. Filter Cartridges with High Performance: The aquarium filter cartridges adopt the high density cotton, more activated carbon and zeolite with 4-layer filtering effect, which can filter and absorb 99% of the sundries, to get the clarity of the water and the healthy environment of the fishes. Excellent Filtration Media: The cartridges made of dense cotton, excellent activated carbon removes odors and reduces water turbidity, extra add zeolite, adsorb ammonia, heavy metals and other harmful components in the water, balance the PH value to achieve a stable water state. Professional After-sales Team: Please choose right model of filter cotton for your filter cartridges and Pls replace the filter cotton in time according to the environment of aquarium. Any problem with using the product, pls find us, then we will help you in time. ASIN B0F9X9GZR8 Size 24 Pack Color White Brand Name ELCCOTYA Directions please check the filter model before order Model Name Filter Cartridges Item Weight 2.18 pounds Manufacturer ELCCOTYA Item model number ELC-PFL Included Components FIlter Cartridges for Aquarium Warranty Description 1 Year Target Audience Keyword Fish Specific Uses for Product FIlter Cartridges for Aquarium Item Package Dimensions L x W x H 9.17 x 6.93 x 6.81 inches