HomeAquarium AccessoriesFluval Fx4 Canister Filter Review - The Ultimate Guide!

Fluval Fx4 Canister Filter Review – The Ultimate Guide!

Thanks for checking out Fluval FX4 Canister Filter review. We recently installed this filter in our aquarium and wanted to share our thoughts. So let’s dive right in!

What We Liked

  1. Enhanced Performance: The multi-stage filtration system of the Fluval FX4 is incredibly efficient, pumping out 700 gallons of water per hour. The Smart Pump technology continuously monitors and optimizes pump performance for maximum efficiency.
  2. Easy Setup: Setting up this canister filter is a breeze. Fill it up with water, plug it into the electrical outlet, and the innovative Smart Pump technology takes over from there. It automatically evacuates any trapped air every 12 hours, ensuring optimal performance.

Multi-functional Utility Valve: The drain at the base of the canister allows for easy water changes and emptying. Thanks to the convenient lid-mounted hosing clips, you can also refill water directly from the canister. It offers an effortless and trouble-free operation.

  1. Effective Filtration: The four removable filter baskets eliminate water bypass, which allows you to customize the filtration according to your aquarium’s needs, whether mechanical, chemical, or biological.
  2. Compact and Quiet Design: Despite its high-performance capabilities, the FX4 canister filter is surprisingly compact and fits easily under most aquariums. The unidirectional impeller reduces noise, while the rubber feet minimize vibration and add stability.

What Can Be Improved

Media Assortment: Some users have found the media assortment included with the filter to be lacking. It could improve if a broader selection of media choices were provided.

International Warranty Coverage: There have been a few instances where customers outside the US had difficulties with warranty claims. Be aware of this if you’re buying the filter from another country.

Quick Verdict

Fluval Fx4 Canister Filter

  • High Performance: Fluval FX4 pumps 700 gallons/hour.
  • Multistage Filtration: Ensures optimal efficiency.
  • Smart Pump: Constantly enhances pump performance.
  • Setup: Quick and easy.
  • Auto Air Evacuation: Ensures peak performance every 12 hours.
  • Innovative Technology: Smart Pump automates process.

The Fluval FX4 High-Performance Canister Aquarium Filter is a top-notch pick for aquarium owners looking for an efficient and customizable filtration system.

Its improved performance, easy setup, and versatile utility valve offer convenience and effectiveness in maintaining an uncluttered and beneficial environment for aquatic pets.

The compact and quiet design is a bonus, making it suitable for various tank sizes. Although the media assortment could be improved, and warranty coverage outside the US may have limitations, these factors shouldn’t overshadow this canister filter’s overall quality and performance.

If you want a reliable and robust filtration system, I highly recommend the Fluval FX4.

The Fluval FX4 High-Performance Canister Aquarium Filter is on Amazon here.

Unboxing: What’s Inside?

Upon unboxing, we discovered the following items inside the box:

  • Fluval FX4 Canister Filter: The main component of the filtration system, built to provide multi-stage filtration for superior water quality.
  • Media Baskets: These baskets are designed with a basket-in-basket tray system, allowing for easy organization of filter media such as activated carbon, ceramic coils, and bio-foam.
  • Rubber Hoses and Intake/Output Tubes: These components connect the canister filter to the aquarium, ensuring efficient water circulation.
  • Utility Valve and Drain Cap: These accessories enable effortless maintenance, including water changes and filter cleaning.
  • Instruction Manual: A comprehensive guide that walks you through the setup and maintenance of the Fluval FX4 Canister Filter.


Enhanced Performance

The Fluval FX4 High-Performance Canister Aquarium Filter is designed to enhance your aquarium’s performance.

Its multi-level cleaning mechanism can output 2,650 liters of water every hour, guaranteeing effective purification and flow.

The filter utilizes patented Smart Pump advanced microchip technology, continuously monitoring and optimizing pump performance. This ensures the filter operates fully and provides your aquatic pets with the best water quality.

Pro-tip: To further enhance the performance of the Fluval FX4, it is recommended to clean and replace the filter media regularly. This will prevent clogging and maintain the filter’s efficiency.


Setting up and operating the Fluval FX4 is a breeze.

Add water, plug in the filter, and let the Smart Pump technology do the rest.

The advanced microchip technology of the filter automatically evacuates trapped air every 12 hours, ensuring optimal water flow and efficiency.

This self-starting feature eliminates manual priming and makes the filter ready to use right out of the box.

Multi-functional Utility Valve

The Fluval FX4 has a multi-functional utility valve that adds convenience to water changes and maintenance.

The drain at the base of the filter lets you quickly empty the canister and perform seamless water changes by draining and refilling water directly from the filter.

This eliminates the need for additional siphoning or complicated water transfer processes. The lid-mounted hosing clips provide a clean and organized storage solution for the hoses when they are not in use.

4-Stage Filtration

The 4-stage filtration system of the Fluval FX4 ensures thorough and effective filtration for your aquarium.

The filter baskets are designed to eliminate water bypass, ensuring all water passes through the designated filter media.

The four removable filter baskets can hold up to 1 gallon (3.9 liters) of media and allow you to stack them in a precise combination that will work best for your specific aquarium needs.

The purification phases encompass physical, chemical, and biological processes, offering thorough cleansing to sustain a hygienic and balanced water habitat.

Pro-tip: To achieve optimal filtration, cleaning and replacing the filter media regularly is recommended. This will prevent clogging and maintain the effectiveness of each filtration stage.

Compact & Quiet Design

The Fluval FX4 is designed with a compact and quiet design, making it suitable for placement under most aquariums.

It measures 16.5 inches (42 cm) in height, making this filtration device comfortably install in tight spaces without hampering the visibility of your fish tank.

The unidirectional impeller of the filter has fewer mechanical joints, reducing noise levels and ensuring quiet operation. Additionally, the rubber feet of the filter help reduce vibration and provide additional stability.

Pro-tip: To further reduce noise and vibration, placing the Fluval FX4 on a soft mat or foam pad is recommended. This will help absorb any remaining vibrations and create a quieter environment for your aquarium.

Fluval Fx4 Canister Filter Review

Our Score: 9.6

Experience the next level of aquarium cleanliness with the Fluval FX4 canister filter! Enjoy enhanced performance with its efficient multi-stage filtration system, and easily manage 700 gallons per hour—benefit from its intelligent Smart Pump technology, optimizing pump functionality for maximum output. Moreover, the set up is simple – add water, plug it in, and let the cutting-edge technology do the rest, including automatic air evacuation. So why wait? Give your aquatic friends the clean and healthy environment they deserve. Purchase the Fluval FX4 canister filter today!

We recently purchased the Fluval FX4 High-Performance Canister Aquarium Filter for our aquarium, and we have been thrilled with its performance.

The most important thing to note is to prime the filter and let it run to build up good bacteria before completely upgrading your filtration system.

The filter’s multi-stage filtration system effectively keeps my tank clean and clear.

This device expels an outstanding 700 gallons of water per hour, courtesy of its patented Smart Pump technology that persistently observes and enhances the pump’s functioning.

We no longer have to worry about trapped air, as the filter auto-evacuates it every 12 hours, ensuring maximum efficiency.

One of the standout features of the FX4 is its multi-functional utility valve. It allows easy canister draining and seamless water changes directly from the filter. The lid-mounted hosing clips offer convenient storage when not in use.

The four removable filter baskets eradicate water bypass and store up to 1 gallon of media each, allowing us to customize the filtration to suit our aquarium’s needs.

Furthermore, we appreciate the compact and quiet design of the filter. It easily fits under the aquarium, and the unidirectional impeller reduces noise. The rubber feet also help reduce vibration and stabilize the setup.

Maintaining the filter’s cleanliness is straightforward; it typically requires attention once every two months.


We hope you liked our Fluval Fx4 Canister Filter Review as we highly recommend this filter. It has vastly improved the water quality in our aquarium and made maintenance much more accessible.

This is particularly advantageous for those owning more expansive aquariums, as it’s designed to accommodate up to a 200-gallon habitat.

Though this filtration system may appear more costly compared to other alternatives available, considering its excellent efficiency and cost-effectiveness in filter renewals, it merits the financial outlay.

If you want a reliable and efficient canister filter, check out the Fluval FX4.

Fishkeeping Expert
Fishkeeping Expert
With years of collective fishkeeping knowledge, we are pleased to share the tank maintenance tips and fish care advice we've picked up along the way. Fishkeeping Expert is home to all fishkeeping tutorials and guides that will help you keep your fish healthy.


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