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.
This fundamental filter is excellent for breeding all types of
aquarium fish, as well as for hatching and raising brine shrimp as it
will not trap nor harm them.
The Dual Action Foam Filters are available in 4 models to accommodate the filtering needs of various-sized aquariums.