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Double Super Biochemical Sponge Filter Air Powered Filter for Aquarium Fish Tank
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This next picture displays a cut away view of a Hydro Pond #2 Filter, showing connection to an air line for use with an air pump.
Outside of this being a double sponge with two bulls eyes instead of one as per standard Hydro Sponge Filters, the internal design is the same for all sponge filters when used with air driven power.

This filter is excellent for both large aquarium use or Patio Pond use (such as container ponds)
General Double Super Biochemical Sponge Filter Air Powered Filter for Aquarium Fish Tank
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Care should be exercised when using an undergravel filter. If the tank is tightly covered with a glass canopy, air will not be pulled from outside the aquarium to mix sufficiently with the water when the surface is agitated. Thus, there will be less dissolved oxygen. This problem can be corrected by using a power head with a venturi or an air pump. Both draw air from outside the aquarium and mix it with water to form small bubbles. Timely water changes and hydro-vacuuming the substrate will remove the particulate matter from the filter bed and keep the filter bed from becoming clogged. Also, do not cover the undergravel filter with decorations or rocks. These will impede the flow of water carrying dissolved oxygen for the bacteria through the filter bed. All of my aquariums have two filters, one of which is always an air driven or powered sponge filter
Photo provided by FlickrSuper Biochemical Sponge Filter Air Powered Filter for Aquarium Fish Tank ..
Photo provided by FlickrFor more years than i properly remember, all of my aquariums have had air pump powered undergravel filters
Photo provided by Flickr
These small, box-like or foam filters powered by air pumps are ideal for small aquariums with a small number of fish. The internal air-driven filter is sufficient to maintain good water conditions, yet gentle enough to keep small aquarium inhabitants free from harm. Most of these devices provide mechanical, chemical, and biological filtration. Be sure to change the filter cartridge or filter material every 3 to 4 weeks to insure good water quality.Power filters can be inefficient. One reason is that they normallyhave their intake directly below the spill-way, therefore asignificant portion of the water being drawn into the filter forcleaning is the water that has just been returned to the from the filter after cleaning. Powerfilters also lose water, not by spilling it or leaking (though eithercan occur with any filter that involves the water leaving the ...), but because when the water is returnedto the , the surface area is greatlyincreased, allowing a large amount of evaporation. Also, these filtersrequire that a large area cut out of the top so that the filter can bemounted on the , this increases airexposure and encourages evaporation. On the positive side, theincrease in surface area will also improve dissolved gas levels,keeping the oxygen available to your fish closer to the amountavailable in the air. This opening in the aquarium top also providesan escape route for jumping fish or for any amphibians or crustaceansyou have in the . The corner box filter is still one of the more common air-driven aquarium filters. It is basically a box that sits inside your aquarium that can contain various filter media and is often powered by an air pump.As mentioned above, the power filter can become ineffective in time, which is why it needs to be regularly cleaned. I clean my box filters maybe once a year, and it’s easy because you have access to everything. The only part that requires a pipe brush is the air intake and bubbler tube, but because of the tube sizes, it would take years for accumulation to build up to the point of slowing down the air flow, if at all. It’s a quick simple clean, and convenient to do so when performing a media change when the box filter has to come out of the aquarium.