Hikari® Aquarium Solutions® Bacto-Surge™ biological action filters are air-driven sponge filters (air pump not included) that promote beneficial bacteria colonization in freshwater or marine aquariums. These highly porous sponges with increased surface area maximize bacterial action.
Soft, yet durable sponge material offers easy cleaning and long life
Uplift tube and air diffuser provide maximum lift and resist clogging
Can be used as a polishing filter or hang-on filter