These filters are the best selling HOB filter worldwide. Their designed has not changed since the Aquaclear's original conception. Although they used to be transparent brown and are now transparent black, changes have been completely unnecessary. They are quiet, efficient and require no specific cartridge or brand of filter media to be run.
The amount of media sold with the aquaclear filters, is many times over what you receive when purchasing media for other HOB filters- Whispers for example, have one cartridge only with a couple dozen grains of carbon sandwiched between some foam. The very idea that you must replace the entire cartridge defeats a filters main use; Biological filtration. This is not so with the aquaclear where you can opt to replace only the carbon, or the spong, etc.
They are not flawless, but their simple design makes alterations easy, and also they can be converted into refugiums and scrubbers. There are also some people who have adapted them into wavemakers by altering the flowpath.
The downsides:
-They require priming before plugging in.
-During a long power outage they may not always restart on their own.
-They can vibrate causing some noise. (Placing a cloth, foam, or rubber between the tank glass and filter will stop this).
-they are only rated for up to 110 Gallons.
The amount of media sold with the aquaclear filters, is many times over what you receive when purchasing media for other HOB filters- Whispers for example, have one cartridge only with a couple dozen grains of carbon sandwiched between some foam. The very idea that you must replace the entire cartridge defeats a filters main use; Biological filtration. This is not so with the aquaclear where you can opt to replace only the carbon, or the spong, etc.
They are not flawless, but their simple design makes alterations easy, and also they can be converted into refugiums and scrubbers. There are also some people who have adapted them into wavemakers by altering the flowpath.
The downsides:
-They require priming before plugging in.
-During a long power outage they may not always restart on their own.
-They can vibrate causing some noise. (Placing a cloth, foam, or rubber between the tank glass and filter will stop this).
-they are only rated for up to 110 Gallons.

