Removes gases and odors from aquariums. Removes discoloration from water. Fits Perfect-a-Flo and Undertow Undergravel Filters. Filled with activated carbon, these cartridges remove harmful gases, odors, and discoloration from your aquarium. The cartridges can even be refilled with carbon, or an ammonia remover of your choice. Instructions: Rinse in tap water before installing. Refill every two-to-four weeks, or as needed.
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