Pack of 8: For optimal performance, we suggest you to change the cartridge at least every 4 weeks
Excellent Filtration Performance: The filter cartridges are made of premium cotton, activated carbon and built-in filter material, which can effectivly absorb odors and discoloration, help to maintain a healthy aquatic environment
Easy Installation: AQQA filter cartridges are designed to be easily inserted or replaced; You only need to take off the dirty cartridge and insert a new one. Please turn off the power when replacing the cartridge
Fits AQQA Aquarium Internal Filter (AQ025): Size Small/Medium/Large will fit AQQA Aquarium Internal Filter 79 GPH/120 GPH/172 GPH respectively
Wide Application：Suitable for freshwater and saltwater aquariums
