Air-driven sponge filters are among the most straightforward and affordable filtration methods available for small tanks. By connecting a standard air pump, the rising bubbles create a vacuum that draws water through the foam, providing efficient circulation and filtration.
Mechanical and Biological Filtration
The filter performs two essential functions: *Mechanical:** The foam cartridge traps physical debris and impurities from the water column. *Biological:** Over time, the sponge becomes home to beneficial nitrifying bacteria that process nitrogenous waste.
When maintenance is required, the sponge should be rinsed. To preserve the bacterial colony, it is crucial to rinse the sponge in a container of tank water rather than under a tap.
Models and Versatility
These filters are available in different sizes: *Single Cartridge:** Perfect for nano tanks and shrimp setups. *Double Cartridge:** Ideal for slightly larger setups, such as 75-liter tanks.
The double model offers superior stability; by cleaning only one sponge at a time, you ensure that a healthy population of bacteria remains in the tank to handle the biological load.
Maintenance and Replacement
If the foam becomes too clogged to be cleaned effectively, it can be replaced. Keep in mind that a new sponge lacks the established bacteria of an old one and will require a short break-in period to reach full biological efficiency. Replacement sponges are readily available and inexpensive.
