【Compatibility Of Aquarium filter media】 The Three-Stage Filtration Tank Filter Maintenance Kit is designed to be compatible with AquaClear 50 Power Filter，Fish Tank Filter for 20- to 50-Gallon Aquariums. 【Upgraded Design Of Tank Filter for Aquariums Maintenance Kit】Compared to traditional carbon filters, carbon sponge has a larger filtration volume, better water mobility, stronger adsorption capacity, and maintains the balance of the aquarium. Foam filters can trap particles and debris. 【Package Contents Of Aquarium Filter Media】Our Aquarium filter Maintenance Kit package includes all necessary filter media, including 4 pack ceramic rings,4 pack mesh bags,4 pack carbon filter,4 pack foam filter ,4 Inlet cotton sleeves,and 2 cleaning brushes ensuring your aquarium maintains optimal water quality. 【Easy Installation】The size standard for sponge filters can be matched with fish tank filters.Installation is quick and easy,No special tools are required. Simply place the White foam filter, black carbon filter and ceramic rings into the filter. 【Replacement Frequency】It is recommended to replace the filter sponge every 4-6 weeks. Adjust the sponge replacement frequency according to the usage of each fish tank.