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The Marina A293 is the correct cartridge replacement for the following:
The Marina Slim Filter Zeolite Cartridge absorbs toxic ammonia while reducing stress on your tropical fish. This convenient 3-pack value set is an easy to use, disposable cartridge that is recommended to be replaced every two weeks. The Marina Carbon Filter is best used in goldfish aquariums.
Marina Aquarium Zeolite Filter Specifications:
It is recommended that you never replace all of your filter cartridges at the same time. This helps to ensure that there is a constant presence of beneficial bacteria. The Marina A293 Zeolite Cartridge features a highly porous ceramic biological filter medium called Ceramitek that helps to optimize biological filtration.