Fluval FX4 Review 2020 – All You Need to Know

This Fluval fx4 review provides you with all the fact and figures you need to know about this product. The review highlights the best features as well as the limitations offered by the machine.

Constantly maintaining your aquarium will definitely increase the lifespan of the fishes and plants that are compounded in it. Of course, the primary way of maintaining your aquarium is by utilizing a reliable filter so as to provide an enabling environment for aqua-organisms.

One filter you want to trust for this work is the Fluval FX4. Compact and highly efficient, this unit is highly recommended for fish keepers who desire quality and good performance.

This canister filter has the capability to pump out over 700 US gal per hour. It’s so reliable that it provides you with clean and healthy water to ensure that your aquatic living organisms survive the ‘ecosystem’. It purifies the water in the tank by filtering the water content as they flow through it.

Not only that, this saves you the hassle of hauling buckets of water in and out of the tank. It’s so magnificent that it can be used for saltwater tank, freshwater tank, turtle tank and so on. Now, not all canister filters are so versatile to do that.

More so, what makes this very product unique is that it needs no assistance at all and it can be used both indoor and outdoor. All you just have to do is to fill it with water and plug it then it’d begin to function all by itself.

It’s a filter that you can’t just go wrong with. It adequately holds at least one US gal of filter media which is quite awesome for those who have a tank that’s very large. The media in the basket, on the other hand, can also be removed so as to ensure that users comfortably change the media to their preferred choice.

In fact, many buyers have prioritized this unit above other canister filters because the product is easier to maintain than others.

Definitely, there are quite a lot to consider about the feature of this amazing product. So, check out the features of this amazing product.

Fluval Canister Filter, FX4 Filter (250 Gal)
  • Multi-stage filter pumps out 700 US Gal (2650 L) of water per hour
  • Smart Pump advanced microchip technology continuously monitors and optimizes pump performance
  • Self-starting – just add water, plug in and Smart Pump will take over. Trapped air auto-evacuated every 12 hours to ensure maximum efficiency
  • Easy water changes eliminate need to lift heavy buckets. Simply attach hosing to output and Smart Pump does the rest
  • Removable, stackable media baskets eliminate water bypass and hold a total of 1 US Gal (3.9 L) of media


  • Makes no noise while it’s functioning.
  • Has ergonomic and durable features.
  • Lightweight and can easily be assembled by anyone.
  • Canister filter mechanism makes it hard for evaporation to take place.
  • Comes with a removable filter media.
  • Can be used for all types of tanks including the big ones.
  • Pumps over 700 gallons in just an hour.
  • Self-priming with nice connections.
  • Voltage this uses is between 110V and 120V.


  • A bit expensive than the conventional ones.
  • The clamp is larger than the rims.

Features and Benefits

Multi-Stage Filter

This canister filter has quite a number of sections interiorly. This is to ensure that no sediment is found in your tank. In fact, it comes with filter media which is very much removable.

The stackable media basket is added so as to ensure that the water is treated to suit the environmental condition of the organism in your aquarium. The water is treated chemically, mechanically and biologically as they flow from one section to the other.

With the use of this, there is apparently no need for utilizing UV light in treating the water. Apart from this, it pumps water so very fast that you don’t have to spend much time on big tanks.

Smart Pump

Of course, this is electrically powered. Its power plug has to be plugged into the power socket before it can carry out its function.

Guess what? It’s self-priming and can easily be assembled based on the term that it can suction the fluid all by itself, then process it without manually filling it.

Just like other canister filters, water is likewise forced into the Fluval fx4 and passes through each section of the filter media. Then, it returns into the tank via the outlet valve (discharge head).

It’s important to note that this unit doesn’t come with a spray bar, but rather it comes with a discharge head and two nozzles.

Inimitable Designs

This product has a cylindrical shape with a height of 16.5” and a diameter of 15”. However, the protruded inlet and outlet valve are 2” long.

The dimension of this product is 15.6 x 15.6 x 17.7 inches if you’re taking the square measurement of it, and it weighs 17.65 pounds. It’s so deep on the inside that the removable filter media that’s stacked at the forth has the capability to withhold 1 US gallon of water.

Indeed, it’s made of black color covered with a lid and the gaskets are made of durable metal. The lid, on the other hand, is so thick that you find it hard to remove. And, it has an ergonomic structure which makes it super unique.


Although it may not come in a box, yet it comes with an instruction book. The instruction book entails all the profitable pieces of information that you may need to utilize it.

It also comes with clamps which are a bit bigger than the rims. However, it doesn’t come with vacuum accessories; they can be ordered separately by utilizing the details on the instruction book after the delivery.

It also has a durable feature even though it’s made of plastic exteriorly. It’s a product that holds a large quantity of water flawlessly.

Ease-of-Use Mechanism

What you’ll find exhilarating about this product is that it makes no noise. It’s a product that you can utilize safely indoor because it’s eco-friendly. Apart from that, canister filters are known to be very easy to maintain.

They are highly recommended because of the comforts that owners enjoy of its use.

Notwithstanding, customers around the globe appreciate the fact the manufacturer makes it easy to use, how? The fact that its media is removable provides users with the flexibility to utilize the media that they prefer.

Finally, the air trapped won’t dissolve in the water when they are done refined. But rather, they’ll be released into the air within 12 hrs.

FAQ - Frequently Asked Questions

1. Does this come with a warranty?

Answer: Yes, it comes with 3-years warranty.

2. Enlighten me on how I can adjust the flow?

Answer: The amazing fact about this product is that the inflow and the outflow can be awesomely adjusted. There are derived units on the outlets and inlets that provide you with the percentage of your adjustment. However, ensure that you do not exceed 50% in adjusting the fluid mechanism.

3. What is the uniqueness of this model?

Answer: What makes it unique is that it can be used for big tanks and you can choose to use any media for it. It’s even more dependable to use for big tanks than several others types.

4. How can I procure this product?

Answer: You can utilize the link that we provided. This link is an avenue that you can seize in purchasing the product. Trust me, it’s safe and reliable to utilize.

5. Does this come with a cleaning kit, if not, how can I get one?

Answer: No! Nevertheless, you can procure it by first contacting the manufacturer on the recommended kit or you may order from them.

Final Verdict

We encourage potential buyers that look forward to purchasing the best canister filter for their aquariums to consider the Fluval fx4. Its fluid mechanism is very controllable and the design is compact.

Also, cleaning it is very easy even though it has a lot of pockets within. Notwithstanding, we hope our amiable readers have been able to utilize this information to determine whether this product is rightly for them or not.

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