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Aqua One AquaNano 40 Filter Media Kit
These 1c carbon cartridges can be cleaned between changes to extend their life and maintain performance. They should be cleaned in tank water and not tap water. The 102c cartridges should be replaced every 16 weeks to ensure peak tank conditions and healthy fish. The 117s sponge foams are ideal as they both trap floating debris and also act as a home for the good bacteria in your aquarium.