are some different kinds of filters?
air or electricity can be used to move water through the filter.
One commonly used filter is called a power filter. The electricity
runs a pump which in turn pushes water through the filter. Filters
provide a surface for bacteria to grow. This helps in biological
filtration. Filters often include carbon for chemical filtration
as well as material for mechanical filtration. Some tanks also
use sponges as biological filters. Sponges provide substrate
for bacterial growth and encourage biological filtration.
are some other kinds of filters?