Round Dual-Action foam filter - up to 5 gal
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The Dual Action Foam Filters are Biological Filters composed of open-celled foam which provides enormous amounts of usable surface area for beneficial bacteria to colonize. This Bacteria breaks down harmful waste substances (ammonia & nitrite), making your aquarium a safer environment for your fish to live and breed.

Accommodates filtering needs up to 5 gal/19 liters.