Among the wide variety of Fluval external filters , one of the most striking without a doubt are those that correspond to the FX series: the Fluval FX4 and the Fluval FX6.
The Fluval FX series is specially designed for large aquariums, be they freshwater or marine aquariums indistinctly.
Fluval FX filter range
Hagen’s Fluval FX range offers power and efficiency, which in many cases is above that offered by other filters with similar characteristics.
It is composed of two filters, the Fluval FX4, for aquariums up to 1,000 liters and the Fluval FX6, for aquariums up to 1,500 liters.
The two have common characteristics, although with slight differences in favor of the Fluval FX6 filter.
But you will better understand the differences between one filter and another, using a table:
Fluval FX4 Vs Fluval Fx6
|Tamaño del Acuario|
|Fluval FX4||1.000 litros|
|Fluval FX6||1.500 litros|
|Flujo de la Bomba|
|Fluval FX4||2.650 litros|
|Fluval FX6||3.500 litros|
|Área mecánica del filtro|
|Fluval FX4||1.400 cm2|
|Fluval FX6||2.100 m2|
|Volumen de material biológico|
|Fluval FX4||3,91 litros|
|Fluval FX6||5,9 litros|
|Volumen de filtración dentro del filtro|
|Fluval FX4||14 litros|
|Fluval FX6||20 litros|
|Caudal efectivo del filtro|
|Fluval FX4||1.700 litros/hora|
|Fluval FX6||2.130 litros/hora|
|Altura máxima de elevación|
|Fluval FX4||2,1 metros|
|Fluval FX6||3,3 metros|
|Fluval FX4||30 W|
|Fluval FX4||40 cm diámetro x 42 cm de alto|
|Fluval FX6||40 cm de diámetro x 53 cm de alto|
|Fluval FX4||Fluval FX6|
|Aquarium size||1,000 liters||1,500 liters|
|Pump Flow||2,650 liters||3,500 liters|
|Filter mechanical area||1,400 cm2||2,100 m2|
|Volume of biological material||3.91 liters||5.9 liters|
|Filtration volume inside filter||14 liters||20 liters|
|Filter effective flow||1,700 liters / hour||2,130 liters / hour|
|Lifting height||2.1 meters|| 3.3 meters
|Power||30 W|| 41W
|Measurements||40 cm diameter x 42 cm high||40 cm diameter x 53 cm high|
Fluval FX4 filter features
Fluval FX6 filter features
(*) They are the only real differences, since the filters are exactly identical.
Fluval FX Filters Features
We have already seen the characteristics of each of the two filters that are part of the Fluval FX range, but there are details that are most likely not clear to you, such as “that” of Smart Pump technology.
Smart Pump Technology
The Smart Pump technology, patented by the manufacturer Fluval , uses an integrated circuit inside the filter (a chip), which allows perfect control of the filter’s operation, without us having to intervene at all:
Through the integrated chip, the speed and force of the rotor is constantly measured, to determine and guarantee that at no time is filtering power lost , all this taking into account that maximum energy efficiency is achieved.
The latest generation Fluval FX filters use 10% less energy than their predecessor models.
Automatic priming and start
One of the features that I like the most about this filter is its self-priming system. Since you don’t have to prime it by hand (or worse), it seems fantastic to me, but simply by pouring water inside and turning it on, the filter regulates itself and expels the air … It’s great !!
And linking with the self-priming and automatic start: the filter stops automatically every 12 hours, to expel any remaining air that may enter the system. Then it starts automatically.
With this system, what is achieved is a more efficient and safe filtration at all times.
Filtering materials and fillers
Fluval FX filters allow, as it could not be less, the three types of filtrations necessary in an aquarium: mechanical, biological and chemical.
While the FX4 allows 5 different filtration stages, the FX6 differentiates up to 6.
Although the filter comes with a standard configuration, it can be configured to our liking, adding or changing materials from the different baskets.
Obviously, we will always have to respect the order of the pre-filter and filter, but the biological and chemical load can be changed, adding or subtracting filter materials.
Fluval FX4 Filter Materials and Fillers
Fluval FX6 Filter Materials and Fillers
One feature of this filter that makes it so practical is its “multifunctional valve”.
The filter has a valve at the bottom, to which a hose can be connected, to carry out the water changes that are usually necessary in the aquarium.
I emphasize the advantage of this valve, which avoids having to look for a container to remove the water from inside the aquarium. A job that must be done manually, and that with this accessory is much faster and cleaner.
FX Gravel Vac
The multifunctional valve can be connected to a separate siphon accessory, to facilitate cleaning the bottom of the aquarium.
When we clean the bottom of the aquarium, we have to make a container, where the dirt and water that we remove when siphoning will go. Although a siphon is necessary and saves a lot of time, it is still quite annoying work, since water always spills out in the end.
With this accessory the inconvenience is eliminated.
Fluval FX4 opinions
The verified opinions of buyers of the Fluval FX4 filter on Amazon give it a maximum score of 5 out of 5 possible.
They stand out:
- Its ease of cleaning and that of the aquarium
- It is very quiet
- Maintains a constant flow of water
- Very simple installation
- Good value for money
Fluval FX6 opinions
The Fluval FX6 filter also has an excellent rating of 4.5 points out of 5 possible.
Verified Amazon Buyers Highlight the Fluval FX6 Filter:
- Good quality material
- Powerful, has a good water flow
- Self priming is great
- Good volume of filter masses
- Very adjusted price, in relation to its quality
- Speed of delivery service
- Makes little noise