External filter for the modern aquarium

200 Gallon Aquarium Fish Tank External Canister Filter With 4 Stage Filtration
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are an external pressurized filter for larger aquariums, upwards of 30-50 gallons. They can be set up underneath or next to your tank, so they’re not as limited in size as power filters. Because their capacity is much more larger than power or internal filters, they are the best at all 3 types of filtration (mechanical, chemical and biological). If you have a large fish tank or your aquarium is overload, you should have a canister filter.
Supreme EZ Clean External Aquarium Filter 150 GPH - (Tanks up to 55 Gallons)
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The mechanism following which it works is quite simple but innovative. The filter draws water out of the aquarium using a tube. There is an external device which helps the water getting filtered. After the water goes through the three-step filtration process, the water is put back into the filter. XP-09 Ultra Silence FishTank Filter External Aquarium Filter Fish Tank Water Pump Remove Oil
Photo provided by FlickrSunsun 4-Stage External Canister Filter with 9-watt UV Sterilizer for Aquarium, 370 GPH ** Click on the image for additional details.
Photo provided by FlickrAquarium External Filters
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The Hydor Professional 350 Aquarium External Filter is quiet and efficient, and it's appropriate for both freshwater and saltwater aquariums. This filter features a modern Japanese-Inspired design with a compact footprint and large filtration volume. The internal motors and added soundproofing make these filters ultra quiet. The integrated priming pump, telescopic intake and adjustable shut-off valves make installation and cleaning a cinch. The tight-fitting filter baskets maximize performance and eliminate water bypass. The 350 Filter comes complete with a large-pore sponge, a filter wool super fine mechanical filter pad, & porous bio-rings for efficient biological filtration. Activated carbon can be easily added.

Tank Size: 60 to 100 gallons Pump Output: 280 gph Filter Circulation: 240 gph (measured w/ media, hose & plumbing) Power Consumption: 22W Filter Volume: 7.0 quarts All necessary hose and plumbing included (suction & delivery tubes, spray bar, etc.) Includes large-pore sponge, a filter wool super fine mechanical filter pad, & porous bio-rings

Canister filters draw water up a lift tube and out of the aquariuminto an external filter chamber or canister where the water is pushedthrough a series of filter media to clean the aquarium water. Thedirection of flow varies between models and brands of canisterfilters, and can be bottom-to-top, top-to-bottom, back-to-front,center-out, or outside-in, depending on the particular brand or modelof canister filter. This aquarium filter media provides , , and/or filtration, depending onwhat kind of filter media you choose to use in the canisterfilter.The Hydor Professional 250 Aquarium External Filter is quiet and efficient, and it's appropriate for both freshwater and saltwater aquariums. This filter features a modern Japanese-Inspired design with a compact footprint and large filtration volume. The internal motors and added soundproofing make these filters ultra quiet. The integrated priming pump, telescopic intake and adjustable shut-off valves make installation and cleaning a cinch. The tight-fitting filter baskets maximize performance and eliminate water bypass. The 250 Filter comes complete with a large-pore sponge, a filter wool super fine mechanical filter pad, & porous bio-rings for efficient biological filtration. Activated carbon can be easily added.

Tank Size: 40 to 75 gallons Pump Output: 225 gph Filter Circulation: 200 gph (measured w/ media, hose & plumbing) Power Consumption: 17W Filter Volume: 5.3 quarts All necessary hose and plumbing included (suction & delivery tubes, spray bar, etc.) Includes large-pore sponge, a filter wool super fine mechanical filter pad, & porous bio-ringsThis 2000EF+ External aquarium filter with built in UV system from 'All Pond Solutions' uses a multi-stage approach to filtration and filters your tank water through a number of distinct filter materials that are separated into different layered baskets to provide biological, mechanical and chemical filtration to your aquarium fish tank.