Undergavel Aquarium Filters
These simple but effective filters are inexpensive and straight forward to maintain. They are powered by an air pump or a power head. Undergravel filters are buried with only the clear air lifts above the gravel. The key to getting the best from such filters is to use atleast two inches of gravel over the base plates.
When To Use An Undergravel Filter
Since these filters sit under the gravel they are the perfect choice as a second filtration method. If you want to boost the cleanliness of your fish's water an undergravel filter will add to the overall biological cleaning capacity of the tank system.
Alternately they are also used as stand alone filters by some fish keepers. An undergravel filter is capable of sustaining a modest fish density when sufficient gravel is used.
Undergravel Aquarium Filter For Sale
The following are undergravel aquarium filters for sale are on eBay.
