Wet-dry filters are not just for marine aquaria:
Freshwater aquariums can also benefit from the use of wet-dry filtration. The aquatic environment will have greater oxygen content and a better oxygen/CO2 exchange.
Wet-dry filters
Here, the filtering media are not totally submerged in the water, but are sprinkled by it.
Gutter filter equipped with thick filtering media (left) and finer ones (right). V ...
Wet-dry Filter: A biological filtration system that is exposed to the air to aid nitrification. This system typically consists of a large box that is placed underneath the aquarium.
Wet-dry Filter - A filter where the water is exposed to air to aid the Nitrification process. Click here to read our filtration guide
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Trickle or wet-dry filters drip or spray aquarium water over a medium. This maximizes oxygen saturation and provides excellent biofiltration. These units are extremely efficient at converting ammonia to nitrate.
Legend: (1) Wet-dry filter (polyester container) (2) Motor driven Protein Skimmer; ...
The standard wet-dry filter utilizes bio-media, such as bio-balls, within the filter. The idea of the bio-balls is they offer a tremendous amount surface area for bacterias to adhere to, as well as, allow air ( oxygen ) down into the media.
pumps in homemade wet-dry filters?
by garyp-at-tekig5.pen.tek.com (Gary R Pimm) (18 Aug 92)
802 powerhead as a wet/dry sump pump
by fssmith/venus.lerc.nasa.gov (Greg Smith) (7 Apr 1992)
Filters & Pumps after Power Outages
by jdp/polstra.
Wet/Dry (Trickle) Filters - More commonly used by saltwater enthusiasts, the wet-dry filter has become more popular with freshwater hobbyists.
The tank came with a wet-dry filter. I removed the media and used it as a sump. I built the lights and calcium reactor myself. I purchased a VHO ballast, pumps, protein skimmer, mechanical float valve, heater, fan, and temperature controller.
At this point, I would move the wet-dry filter, if there is one, to the relocated tank, and get the protein skimmer running. After a few more days, you can gradually start adding in the fish, but spread this over a week or two.
Oxygen can be added to the aquarium through an air pump attached to some sort of air stone, by utilizing a filter that creates much surface disturbance, or by using a wet-dry filter system.
A sump is a water basin below the aquarium that water is allowed to fall into and then from which the water is pumped back up to the aquarium. A sump can be a spare aquarium, a wet-dry filter, a rubber maid tote, or if you want to go overboard, ...
 See also: Water, Dry filter, Filter, Aquarium, Fish
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