Home/Filtration & Media/Filtration/Internal/U Series/U2 Underwater Filter, up to 30 US Gal (110 L)

U2 Underwater Filter, up to 30 US Gal (110 L)

SKU: A470 | UPC: 015561104708
Format: 4 L x 3.5 W x 8 H" (10 L x 9 W x 20 H cm)
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Offering outstanding 3-stage filtration, increased water movement and vital aeration, Fluval U-Series internal filters are the perfect solution where external filtration is not possible.

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  • Designed for aquarium up to 30 gallons
  • Use as a primary filter for smaller aquariums, or supplementary filter for larger aquariums
  • Position horizontally for shallow tanks, larger tanks with low water levels, or to create a decorative waterfall feature
  • Position vertically against aquarium wall to create currents or customized flow patterns
  • Convenient flip-top lid allows for quick and easy access to filter cartridge for maintenance or replacement
  • Adjustable 3-way flow control – Top Output for circulation and oxygenation, Integrated Spray Bar for a gentle even flow, and Bottom Output for deepwater agitation
  • BioMax biological media included
  • Made in Italy
  • Ideal for freshwater, saltwater and reptile environments
MODEL
Item #
U1
A465
U2
A470
U3
A475
U4
A480
UPC015561104654015561104708015561104753015561104807
Aquarium Capacity14.5 US Gal
(55 L)
12-30 US Gal
(45-110 L)
24-40 US Gal
(90-150 L)
34-65 US Gal
(130-240 L)
Pump Output65 US Gal/h
(250 L/h)
105 US Gal/h
(400 L/h)
155 US Gal/h
(600 L/h)
260 US Gal/h
(1000 L/h)
Wattage
(120V/60Hz)
5 W5 W6 W12 W
Wattage
(230-240V/50Hz)
4.5 W5 W7.5 W10 W
Dimensions
(L x W x H)
4 x 3 x 6"
(10 x 8 x 15 cm)
8 x 3.5 x 4"
(20 x 9 x 10 cm)
10.5 x 3.25 x 4"
(26.7 x 8.3 x 10 cm)
13 x 4 x 4.5"
(33 x 10 x 11 cm)
  • 2 Foam Pads
  • 2 Poly/Carbon Cartridges
  • BioMax Biological Rings

3 YEAR LIMITED WARRANTY

Fluval U Series Power Filters are guaranteed against defects in material or workmanship under normal aquarium usage and service for 3 years. We offer a 3 year guarantee on all nonreplaceable parts which means that the filter will be repaired or replaced at the manufacturer’s discretion, free of charge, when the complete pump is returned with proof of purchase and postage paid. This warranty does not apply to any filter that has been subjected to misuse, negligence, or tampering. No liability is assumed with respect to loss or damage to livestock or personal property irrespective of the cause thereof.

INSTRUCTION MANUAL

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UVC2020-09-23T08:40:45-04:00

UVC IN-LINE CLARIFIER

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My aquarium is cloudy and smells bad. Will the UVC clarifier help?

If the cloudiness is due to suspended bacteria or algae, the UVC clarifier will indeed clear the water, provided it is installed as instructed. To help reduce smells, the best solution is the use of activated carbon. It is also advisable to investigate the source of the odor: if it is due to decomposing organic matter make sure to remove it and perform a regular partial water changes.

Does the UVC clarifier prevent algae growth on surfaces within the aquarium?

The UVC clarifier will only neutralize suspended bacteria and algae, and as such will not prevent the growth of most algae on the aquarium glass, gravel, décor, etc. Some surface-dwelling algae species exist as spores at some life stages, however: the UVC clarifier will help prevent the growth of these species.

Will using the UVC clarifier harm the beneficial bacteria in my aquarium?

The beneficial species of heterotrophic and nitrifying bacteria in an aquarium live on surfaces in the filter, in the substrate, on plants, etc. They do not live in the water column and as such are entirely unnaffected by UVC sterilization.

Will the UVC clarifier have any negative effects on the beneficial microorganisms in my reef aquarium?

The UVC clarifier may affect some beneficial microorganisms present in the water column, including ones that may be a food source for some species of fish and coral. In healthy reef aquariums, however, these microorganisms are very abundant and the UVC clarifier won’t significantly affect their population levels.

Will the UVC clarifier help keep my fish from getting sick?

The UVC clarifier helps to keep aquariums clean and healthy, but it is not a treatment for sick fish. Always consult your local aquatics retailer for assistance in preventing or treating aquarium fish diseases.

My fish have ich, will the UVC clarifier cure them?

In general, parasites are too large to be effectively terminated by UVC light. To treat ich, we recommend consulting your local aquatics retailer for assistance.

I am treating my fish with medication. Should I continue to run the UVC clarifier while doing so?

In order to ensure the most effective treatment, the UVC clarifier should be unplugged while medicating fish.

How do I know the UVC clarifier is working?

The 24-hour timer features an operating status light. If it’s green, the UVC bulb is functioning normally. If it’s red, the bulb has expired and the UVC clarifier must be replaced.

How long should I run the UVC clarifier for?

We recommend first running the UVC clarifier intermittently, for 4 hours a day. If the desired effects are not achieved, gradually increase the amount of time the unit runs each day until they are.

How will the UVC clarifier work following a power interruption?

The UVC clarifier will revert to the same operating time that was initially selected once it is reconnected to a power source. For example, if the timer was set to operate for 4 hours a day, it will continue to operate for 4 hours from the moment power is re-established. As the timer does not keep track of the time of day, if you want the UVC unit to run for 4 hours a day as of 8 am, for example, the unit should be connected to a power source at 8 am.

What size hosing does the UVC clarifier accept?

The UVC clarifier connects in-line to all canister filter hosing with an internal diameter of 5/8″ (or 16 mm), such as the Fluval 07 series.

Does the UVC clarifier need to be mounted with the mounting screws or can it hang in-line with the hosing?

We recommend mounting the UVC clarifier with the two mounting screws provided. However, if you choose not to do so, the unit will still function normally.

Is there a particular orientation the UVC clarifier should be mounted?

The UVC clarifier should be mounted vertically, with the mounting screws at the top and the hose connections at the bottom. This will help with weight distribution. However, if the unit is mounted in an alternate orientation, provided the mounting is secure, the unit will function normally.

My filter stopped operating for a few hours but the UVC clarifier was still plugged in and working. Is it safe to continue using the unit or does it need to be replaced?

The unit is safe to continue using.

My filter stopped operating for a few hours but the UVC clarifier was still plugged in and working. Is it safe to continue using the unit or does it need to be replaced?

The unit is safe to continue using.

I accidentally dropped my UVC clarifier. How do I know if the bulb is broken? Should the unit be replaced as a precaution?

It is not possible to open the UVC clarifier to verify if the bulb is broken. As such, we recommend replacing the unit as a precaution.

What makes a CCFL bulb better than traditional fluorescent bulbs?

A Cold Cathode Fluorescent Light (CCFL) runs cooler than a traditional fluorescent bulb and as such lasts up to 3 times longer.

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07 SERIES2019-04-29T15:17:18-04:00

07 SERIES

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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 07 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 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 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?

07 series filters are closed re-circulation 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 odours 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?

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 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.

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

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.

Can I place Bio-Foam Max filter pads on both sides of the Pre-Filter Cartridge?

No. Due to their shape, Bio-Foam Max filter pads can only be inserted on the left side of the Pre-Filter Cartridge, as the first filter media.

What are the correct steps for disconnecting the AquaStop valve?

How do I maintain the impeller assembly?

How should I clean the intake stem and strainer?

What’s the best way to clean the ribbed hosing?

How do I clean the primer assembly and cover?

Do you have any motorhead gasket maintenance tips?

How do I maintain the AquaStop O-ring gaskets?

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FX SERIES2019-03-25T05:47:10-04:00

FX SERIES

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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 noticed decreased performance and 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 (i.e. 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 lubricant (#A325) to the o-ring.

How does head height affect filter output performance?

This is a closed recirculation filter system, therefore, head height has no real impact on performance. Length of tubing and 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 versus 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 the filter being too powerful for use with healthy fish, many of whom swim in natural habitats with stronger currents. Take note 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)?

Yes, 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.

What’s the best combination of media if I’m keeping very messy fish?

For aquariums with species that are strong feeders and fairly messy in nature (i.e. digging habits), we recommend using Fluval Fine-Filter pad and chemical media (i.e. carbon) at the bottom level, Fluval Bio-Max in the middle and Fluval Pre-filter rings at the top level.

What motor maintenance should I perform regularly to ensure the longevity of my filter?

Learn how to properly maintain your FX canister filter motor from Fluval’s head aquatic expert.

What general maintenance tips do you have for this filtration series?

Learn valuable tips from our head aquatic expert on how to maintain and take care of your Fluval FX canister filter.

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, the impeller does eventually wear and is, therefore, not covered under warranty. Equally important is verifying that the filter has been properly primed (always ensure filter output is above water surface when priming).

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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G SERIES2019-03-25T05:47:53-04:00

G SERIES

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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?

G 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?

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 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.

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

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.

Why do conductivity readings sometimes differ from those taken by a refractometer?

The Fluval G conductivity accuracy is rated at +/- 8%, so it is normal to see a difference. More variance is to be expected in marine aquariums, as fine air bubbles originating from the protein skimmer can interfere with the conductivity sensor and cause inaccurate readings).

Why do the instructions for the TRI-EX filter cartridge recommend to first lower the phosphate levels?

This is simply to help you get the best results and lifespan out of this resin.

My filter media cartridges sometimes drip water onto the LCD display when removed. Can this damage the unit?

We advise removing water from the LCD display as soon as possible, as it is not designed to be waterproof.

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AMMONIA REMOVER2019-03-08T07:23:17-04:00

AMMONIA REMOVER

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Does Fluval Ammonia Remover absorb liquid plant food in my aquarium?

No, it does not.

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CARBON2020-06-30T19:28:32-04:00

CARBON

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