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.
Great For Use In Freshwater Or Marine Applications
Highly porous sponge maximizes bacterial action
Increased surface area offers maximum bacteria colonization
Soft sponge material is easily cleaned
Polyether foam for longer life
Uplift tube and air diffuser combination provide maximum lift and won't easily clog
Other uses: polishing filter for canister filter applications, hang on filter applications or uplift tubes of undergravel filters.