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Bacto-Surge® Biological Action Filters are air-driven sponge filters (air pump not included) which offer superior mechanical and biological filtration of your aquarium water. The highly porous sponge contains extreme surface area and thousands of microscopic pores where aerobic bacteria, hydrated with oxygenated water, can grow and flourish.
|Up to 10 gallons||Up to 40 gallons||Up to 75 gallons||Up to 125 gallons|
|Foam size: 1.77” H x 2.17” R||Foam size: 2” H x 4.75” D||Foam size: 4” H x 4.5” D||Foam size: 5.75” H x 6.25” D|
Note: The finer hole structure allows the Bacto-Surge® Foam Filters to provide significantly more bacterial colonization than competitive foam filters of similar size.