Home/Filtration & Media/Filtration/External/06 Series/306 Canister Filter, up to 70 US Gal (300 L)

306 Canister Filter, up to 70 US Gal (300 L)

SKU: A212 | UPC: 015561102124
Format: 10 L x 7 W x 18 H" (25 L x 18 W x 46 H cm)
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The 06-Series provides next-generation functionality and performance from one of the most dependable lines of multi-stage canister filters ever built.

  • Designed for aquariums up to 70 US Gal / 300 L
  • Square-shaped canister design holds 35-50% more water than round canisters of similar size
  • Improved motor performance – reduces maintenance frequency, increases flow rates and head pressure
  • Sound-dampening impeller offers 8-15% quieter operation than previous generation
  • Patented Aqua-Stop valves for easy hose disconnections
  • Redesigned impeller cover for added durability
  • Re-engineered priming system for easier start-up
  • Filter media included – mechanical, chemical and biological
  • Complex cleansing path maximizes water contact time with filtration media
  • Multiple removable media baskets
  • Strong, single-motion lift-lock clamps offer a more secure closure and easier filter access
  • Hose lock nuts for added security
  • Made in Italy
  • For use in freshwater and saltwater aquariums
Item #
Aquarium Capacity25 US Gal
(100 L)
45 US Gal
(200 L)
70 US Gal
(300 L)
100 US Gal
(400 L)
Pump Output145 US Gal/h
(550 L/h)
206 US Gal/h
(780 L/h)
303 US Gal/h
(1150 L/h)
383 US Gal/h
(1450 L/h)
Filter Circulation95 US Gal/h
(360 L/h)
121 US Gal/h
(450 L/h)
206 US Gal/h
(780 L/h)
245 US Gal/h
(930 L/h)
Head Height
4.8 ft
(1.45 m)
4.8 ft
(1.45 m)
5.8 ft
(1.75 m)
7.5 ft
(2.25 m)
Media Capacity0.8 US Gal
(3.2 L)
1.2 US Gal
(4.6 L)
1.7 US Gal
(6.6 L)
2.2 US Gal
(8.5 L)
10 W10 W16 W23 W
10 W10 W15 W20 W
(L x W x H)
8 x 6 x 15"
(20 x 15 x 38 cm)
8 x 7 x 18"
(20 x 18 x 46 cm)
10 x 7 x 18"
(25 x 18 x 46 cm)
10 x 8 x 20"
(25 x 20 x 50.8 cm)
  • 4 foam pads
  • 2 x 70 g carbon
  • 2 x polishing pads
  • 2 x 120 g BioMax
  • 2 x Bio-Foam
  • AquaStop valve assembly
  • Ribbed hosing
  • 2 rim connectors
  • Intake tube
  • Intake strainer
  • Output nozzle
  • 2 rubber connectors
  • Instruction manual
  • Quick start manual


Fluval 06 Series External Filters are guaranteed against defects in material and workmanship under normal aquarium usage and service for 3 years from date of purchase. Non-replaceable and non-serviceable parts will be repaired or replaced at Hagen’s discretion, free of charge, when the complete filter is returned with all components along with a valid proof of purchase and postage paid. This warranty does not apply to any filter that has been subject to misuse, negligence or tampering. It does not apply to filters which have been incorrectly assembled or unsuitably maintained or where installation and maintenance instructions have not been followed correctly. The warranty does not apply to wear and tear parts such as the impeller, impeller cover or motor seal. No liability is assumed with respect to loss or damage to livestock or personal property irrespective of the cause thereof. Before returning the filter under warranty terms, please ensure that all setup and maintenance instructions have been followed. If you are in doubt, please contact your local aquatic specialist retailer for further advice before returning the product.


06 SERIES2019-03-08T07:12:57+00:00



Can I connect an inline heater model to my filter?

No. Fluval canister filters use ribbed flexible hosing, which is not ideal for installing such equipment.

How do I remove surface film from my aquarium water?

A surface film can be the result of cooking smoke, skin oils, dust accumulation, and/or fish food, which naturally includes fat content. We recommend the use of a surface skimmer (#A240) connected to the inlet of your Fluval 06 filter.

The lid on my filter is difficult to close and leaks near the motor head clips.

We recommend a thorough cleaning of the motor head O-ring and applying Fluval silicone lubricant (#A325). It’s normal for the O-ring to require replacement after a few years of use. Ensure that the O-ring is inserted correctly into the motor head groove, and that the motor head is properly positioned, aligning the power cord with the notch on the canister.

How do you setup the 06 Series filter?

How do I prevent baby fish from being pulled into my filter?

Make an incision in the center of a coarse, open cell foam filter block and insert the siphon tube strainer into it. We recommend rinsing the block every 2 weeks to ensure proper filtration performance.

Can I connect an inline heater model to my filter?

No. Fluval canister filters use ribbed flexible hosing, which is not ideal for installing such equipment.

Why do I have difficulty restarting my canister filter after cleaning it?

First, check your impeller and impeller shaft as it’s possible either of these are damaged and need to be replaced, or are very dirty and require cleaning. It’s also possible the impeller cover has not been reattached correctly. Finally, verify that the filter has been properly primed: always ensure that the filter output is above the water surface when priming.

I’ve noticed decreased performance and the need for increased maintenance frequency on my canister filter. Am I doing something wrong?

This usually indicates an increased load on your filter due to either the growth of your fish, the recent introduction of additional fish, increased waste production (leftover food, excrement, etc.), or clogged filter media in need of replacement.

I have a marine tank and noticed bursts of air coming out of my filter output. Should I be concerned?

Air input into your system is most likely coming from the skimmer. Fine air bubbles are gathering in the canister filter and are being ejected in bursts. Consider adding a bubble trap for your skimmer.

I replaced the impeller of my canister filter and noticed a small leak coming from the handle when shutting down. What should I do?

The leak is most likely from the canister O-ring. Before you purchase a replacement, remove and clean it with warm water. Thoroughly wipe the receiving groove in the filter with a soft cloth. Apply Fluval silicone lubricant (#A325) to the O-ring.

How does head height affect filter output performance?

06 series filters are closed recirculation filter systems: head height has no real impact on performance. The length of tubing and the types of filter media are key factors affecting filter output performance. We recommend never exceeding the specified vertical distance in your instruction manual as this will cause the filter to exceed the maximum head pressure value, which could cause the filter to leak and fail.

I change the carbon in my filter every couple of weeks. Is this too often?

No. It’s better (and easier) to prevent odors rather than having to remove them once they’ve accumulated. Some fish are messy eaters, or are more prone to producing large amounts of waste, so prevention is key.

Do you have any tips for fixing common filtration issues?

Aquatic expert Tom Sarac discusses the 6 most common filter problems, while providing helpful troubleshooting tips to resolve them.

I found a fish stuck to the intake of my filter. Is the flow too strong?

You don’t need to be concerned about your filter being too powerful for use with healthy fish, many of whom swim in natural habitats with much stronger currents. If a fish became stuck to the intake of your filter, it’s likely that the fish was already sick. Take note that you can adjust the filter output strength to suit your particular fish species.

I just purchased a Fluval canister filter for my well-stocked tank. Is there additional media required, other than what came with the filter?

Fluval Total Clear will crystallize the water and rapidly remove organics, providing better overall water quality. Also consider adding a coarse pre-filter media at the bottom of the filter to support improved long-term performance.

Why is the motor of my canister filter making a low, rumbling noise?

Noise originating from the motor suggests that the impeller assembly needs to be replaced. As the only moving part in your filter that operates 24 hours/day, the impeller does eventually wear and is therefore not covered under warranty. Also, verify that the filter has been properly primed (always ensure the filter output is above the water surface when priming), as this will help ensure trapped air is not the cause of the noise.

How do I know when it’s time to change my filter media?

Aquatic expert Tom Sarac provides guidelines on knowing when to switch out the most common Fluval media for your aquarium filter.

Why is my canister filter emitting bursts of fine air bubbles on my aquarium?

FRESHWATER: It’s important to perform regular filter maintenance (media rinsing and replacement) to prevent media from compacting, which can result in air accumulation. Also make sure to verify the inlet rubber hose connector that attaches to the siphon tube, which does dry out over time and becomes hard and non-flexible, thus requiring periodic replacement.

SALTWATER: This is probably due to your filter taking in the fine air bubbles introduced to the aquarium by protein skimmers. Make sure to use an effective bubble trap at the skimmer output or within the sump to prevent this from happening.

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