Best External filter

  • Large capacily stackable media trays allow for multi-stage...
  • Quick & easy push-button primer and two independent 360...
  • Flow rate shut-off valves adjust water flow and provide for...
  • Good for up to 75 gallon fish tanks SunSun parts can be...
  • 3 media trays capable of handling your choice of filtration...
  • Convenient self-priming pump that eliminates the need for...
  • Water filter for nano tanks and aquariums up to 10 gallons
  • Created for use in both freshwater and saltwater aquariums
  • Designed to be easy for new users to prime, customize, and...
  • Polar Aurora
  • Misc.
  • Water filter for nano tanks and aquariums up to 10 gallons
  • Created for use in both freshwater and saltwater aquariums
  • Designed to be easy for new users to prime, customize, and...
  • Canister filters for aquariums use high water pressure, from...
  • 3 media trays capable of handling your choice of filtration...
  • Convenient self-priming pump that eliminates the need for...

Our Top External filter Pick

Cascade CCF3UL Canister Filter, 100 Gallon, 265gph
  • Large capacily stackable media trays allow for multi-stage filtration
  • Quick & easy push-button primer and two independent 360 degree rotating taps
  • Flow rate shut-off valves adjust water flow and provide for easy maintainance.
  • The filter is 110V
  • For Aquariums up to 100 Gallon

Everything for animals: External filter Video Guide

External filters are not sunk into the garden pond, but positioned outside the water surface. This measure provides advantages and allows the filter, for example, to be checked at any time for functionality and performance. In case of defects, the filter does not have to be removed from the pond, but can simply be replaced directly and without great effort by a new model. External filters are available in different sizes and therefore with different capacities. Especially for larger ponds with a water volume between 5,000 and 80,000 litres, external filters are preferable and provide a clean habitat for plants and fish. In fish ponds, external filters are the better choice due to their larger water passage than internal filters, with which the pond can be kept only conditionally and often not sufficiently clean.

Filter systems are based on an identical concept and serve to produce oxygen exchange in the water and to clean the garden pond of unwanted contamination. The more water there is in the pond and the larger it is, the more powerful the filter must be. In large garden ponds, external filters have proved their worth due to their higher performance and are mainly used because they can allow large quantities of water to pass through and process them within a short time. For an external filter to fulfil its function without restriction and to be suitable for the size and quantity of water in the garden pond, its performance must be adapted to the local conditions. With the right filtration, every pond becomes a biotope and is suitable as a healthy habitat for aquatic plants and fish













External filters are particularly powerful and are suitable for very large garden ponds or natural ponds on the property. However, they also require more power than proportionally much smaller internal filters. You also need a footprint that offers enough space for the voluminous size and allows the external filter to be made practical and usable. On slopes or in dense undergrowth, it is very difficult to place an external filter, which can present a greater challenge for filtering the garden pond. As there are different sizes, capacities and operating modes of external filters, it is important to find out the right model for your garden pond through consultation and to ensure that the capacity is matched to the quantity of water.

High-quality external filters can be relatively cost-intensive and require a lot of space on the property. A selection based on quality should therefore be the focus and help to make the right decision and to purchase the external filter to match the garden pond. The power indicated by the manufacturer is only an indication and should not be used as the sole criterion for the decision. It is more helpful if pond owners look around in the evaluations of other buyers and find out there which external filter convinces in price and performance and fits to their own garden pond. Test reports also support the purchase and prevent wrong decisions. If an external filter is not powerful enough and cannot circulate the existing water quantity, the garden pond will not be completely cleaned and in the worst case can tip over due to contamination. The oxygen content is also sustainably influenced by the external filter and serves as the basis of life for plant and animal inhabitants in the water. When buying external filters, comparisons can be helpful and generally rule out the problem of too little performance or too high energy consumption.

TOP 5 External filter Bestseller

Cascade CCF3UL Canister Filter, 100 Gallon, 265gph
  • Large capacily stackable media trays allow for multi-stage filtration
  • Quick & easy push-button primer and two independent 360 degree rotating taps
  • Flow rate shut-off valves adjust water flow and provide for easy maintainance.
  • The filter is 110V
  • For Aquariums up to 100 Gallon
Polar Aurora 3-Stage External Aquarium Filter 265gph with Builtin Pump Kit Canister
  • Good for up to 75 gallon fish tanks SunSun parts can be applied Flow rate: 264 GPH (1000L/hr) Pump Power: 18W Hose size: 3/4" Max-H: 4.6 feet
  • 3 media trays capable of handling your choice of filtration media; Comes with an adjustable spray bar. This is a helpful feature if you want to adjust the output flow from the filter
  • Convenient self-priming pump that eliminates the need for manual siphoning; Single valve disconnect & priming pump ease routine maintenance
  • Canister filters for aquariums use high water pressure, from a properly powered pump, to force water through the dense filter media. A pump can draw water from an under-gravel filter, and run it into a canister for double filtration
  • The three flexible media trays allow you to add other filtration media such as SunSun's activated carbons, ceramic rings or bio-balls to achieve excellent mechanical, chemical, and biological filtration.
Fluval 206 External Filter
  • Multi-stage filtration for healthy fresh & saltwater aquariums
  • Suitable for aquariums up to 45 gallons
  • Sound dampening impeller design for a quieter operation
  • Equipped with a clog-proof intake strainer and a dual layer foam screen
  • Built with a patented Aquastop Valve, multiple filtration baskets, and rim connector assemblies; 3 year warranty
Zoo Med Nano 10 External Canister Filter, up to 10 Gallons
  • Water filter for nano tanks and aquariums up to 10 gallons
  • Created for use in both freshwater and saltwater aquariums
  • Designed to be easy for new users to prime, customize, and even open
  • This filter was also built to be convenient with a compact, space saving design and quiet, anti vibration brushings
  • Package includes the Nano 10 external canister filter, spray bar system for greater aeration, mechanical filter sponge, bio ceramic filtration media, and carbon chemical filtration media
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