Fluval 306 Review

Review For TheĀ Fluval 306 Canister Filter

Today we are reviewing the Fluval 306 Canister Filter which is an aquarium filter suitable for both freshwater or saltwater aquariums up to 300 L (70 US Gal). Many fish keepers find that canister filters are superior at handling the water volume as well as provide extra convenience features. The Fluval 306 Aquarium Filter is one such product, and we find ourselves rating it a solid 4 out of 5 stars. In the Fluval 306 review below, we will discuss in more detail why we give it this rating.

Pros And Cons


  • It can provide biological, chemical, and mechanical filtration
  • This canister filter can hold more filter media
  • The Fluval 306 is quieter than similar canister filters
  • It is backed by a three-year warranty


  • This unit has a higher price point than similar canister filters
  • Its interior can be more difficult to clean by hand
  • The filter does not have a height detector for flow output

Fluval 306 Key Features

The multiple staged filtration provided by this external canister is capable of cleaning the water column in a fresh or saltwater aquarium. The Fluval 306 has a strong pump motor which is rated by Fluval at 303-gallons per hour, a feature that allows it to circulate the water in a medium-sized tank multiple times during that period.

It is designed with a rectangular body which allows it hold up to 50-percent more filter media and water than a cylinder-shaped canister would be able to house. The Insta-Prime feature permits a user to start the filter without needing to manually siphon.

Fluval 306 Build Quality And Materials Used

The plastics used for the canister body provide a rigid frame that will not flex under pressure and it should withstand normal wear without damage. A redesigned motor can provide strong hydraulic motion throughout the system with a minimal amount of maintenance. The Fluval 306 Aquarium Filter comes with two plastic media baskets that should last well past the product warranty. All hose lock nuts and lift-lock housing clamps are strong and operate without misalignment or stiffness.

Operating Features

A sound dampening impeller allows the Fluval 306 to run up to 15-percent quieter than previous designs. The impeller cover was redesigned to provide more protection to the blades as they circulate water. It is equipped with a new primer configuration that allows it to start easy and fast. The filtration compartments are built to allow users media customization without affecting other compartments.

Convenience Features

This canister is equipped with two vertical sitting foam pre-filters that can strain debris before it enters into the biological or chemical chambers. An intake strainer has been added to help reduce the risk of possible clogs in the system. The lift lock clamps combine with a gasket that provides a tight seal between the media chambers and the pump motor housing, which should prevent water from leaking out during operation. This filter uses Aqua Stop valves, a design feature that allows the user to stop the flow of water without having to disconnect the hoses.

Fluval Availability And Support

The brand itself is widely known throughout the fishkeeping industry in Europe and North America. Not only does the manufacturer provide a three-year warranty on the filter, they also maintain a strong dealer presence throughout these regions. They also offer customer support and services on their website, Facebook, Twitter, and YouTube.

Fluval 306 Review Product Comparison

Fluval 306 vs The SunSun HW303B

The SunSun HW303B canister filter is capable of handling aquariums that are a bit larger than the 306 is capable of filtering. It also has a UV filter, a feature that adds an additional level of water filtration. The SunSun may be preferred by users with tanks that suffer algae issues.

Fluval 306 vs Penn Plax Cascade 700

The Penn Plax Cascade 700 filter has a maximum tank size that is a bit smaller than the Fluval 306 Aquarium Filter (65 compared to 75-gallons) but offers a more stable footing thanks to a larger base. The flow valves rotate 360-degrees, providing more options for location. It may be ideal for users on a tighter budget.

Fluval 306 vs Marineland Magniflow 360

The Marineland Magniflow 360 filter works well with tanks up to 100-gallons, more than the Fluval 306 can handle. There are twice as many trays and it can be easier to clean and maintain. It provides a more specialized filter media option for advanced users.

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