Currently have a 10gallon but will upgrade shortly to a 30ish for a yellow eared turtle. Does this sit on the bottom where it could suck in the food and waste that collects on the bottom where my river rocks are? It has proven hard to get that out and the pleccu is not cleaning it up as of now.

Mine is laying on the bottom of my tank and i have never had it sitting upright. I can tell you it does pretty well sucking everything up. However, i usually have one spot in the tank, right underneath the filter where debris sits. When I need to water change I just make sure I get the debris out with a fish net. That seems to work pretty well. It is the best filter I have had so far (with a turtle that has killed 4 filters), just make sure to clean the motor fan with every water change or filter media change.

Does the U4 filter have space to add activated carbon pellets?

Yes it can, in the center of the filter there a removeable plastic cage. I put a small Chemi Pure bag in it. But I didn't care for this filter and not cause it didn't work. But I was wanting something more as a skimmer type filter and I wasn't getting enough flow out this filter unit. But it did work, if your running this on a smaller tank say no 30 gal freshwater ok. I was running it on a 29 gal reef tank with lots of live rock and it couldn't push enough water around it. But it did filter the water good.

Do all 3 outputs work at the same time?

No, you have to pick a setting. I use mine for moving water in the bottom of my tank. It also seems to be he strongest setting out of the 3 choices

Can I change the direction of the water coming out of the nozzles? For example directing it upwards instead of horizontal.

There's a small directional piece on the end of each nozzle you can turn to minimally direct the flow - but not nearly that much.

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U4 Underwater Filter, Freshwater and Saltwater Aquarium Filter, A480, Black

Product ID: 254683861

Details

Brand
Fluval
Capacity
240 Liters
Included components
Filter
Material
Metal
Package information
Filtration

💧1000 L/h max flow

⚙️3-stage filtration system

🛠️Flip-top quick access

R2167

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💧 Elevate your aquarium game with Fluval U4 — clarity and control at your fingertips!

EFFORTLESS MAINTENANCE - Flip-top lid design lets you swap cartridges in seconds—no hassle, no mess.
POWERFUL 1000 L H FLOW - Effortlessly maintain crystal-clear water with high-performance circulation.
VERSATILE INSTALLATION - Position horizontally or vertically to customize flow and create stunning water effects.
MULTI ENVIRONMENT READY - Perfect for freshwater, saltwater, and reptile tanks up to 65 gallons.
TRIPLE STAGE FILTRATION - Foam, poly/carbon, and BioMax media trap debris, impurities, and optimize biological balance.

The Fluval U4 Underwater Filter delivers powerful 1000 L/h flow with a proven 3-stage filtration system combining foam, poly/carbon, and BioMax media for superior water clarity and biological balance. Designed for freshwater, saltwater, and reptile tanks up to 65 gallons, its sleek, versatile design allows horizontal or vertical placement to customize water flow and create decorative effects. The innovative flip-top lid ensures quick, tool-free cartridge changes, making maintenance effortless for busy aquarists who demand both performance and style.

Specifications

ASIN	B001XRXY1G
Best Sellers Rank	#9,569 in Pet Supplies ( See Top 100 in Pet Supplies ) #486 in Aquarium Accessories
Brand	Fluval
Brand Name	Fluval
Capacity	240 liters
Container Type	Filtration container
Customer Reviews	4.3 out of 5 stars 3,198 Reviews
Global Trade Identification Number	00015561104807
Included Components	Filter
Included components	Filter
Installation Type	Underwater
Item Dimensions L x W x H	13L x 12W x 36H centimeters
Item Type Name	HAGEN FLUVAL U4 UNDERWATER FILTER
Item Weight	1.12 Kilograms
Manufacturer	Rolf C. Hagen (USA) Corp.
Material	Metal
Material Type	Metal
Maximum Flow Rate	1000 Liters Per Hour
Model Name	HAGEN FLUVAL U4 UNDERWATER FILTER
Model Number	A480A1
Number of Items	1
Number of Packs	1
Package information	Filtration container
Part Number	HGA480
Power Source	Corded Electric
Product dimensions	13L x 12W x 36H centimeters
Purification Method	Biological Filtration
Supported Water TDS Level Maximum (PPM)	350
UPC	015561104807 764999862437 155611048009 015561104784 081175371515
Unit Count	1 Count
Upper Temperature Rating	80 Degrees Fahrenheit

Reviews

F**Z

avoid

stopped working completely after 1.5 month of purchase

6.06.2026

M**.

Top 🔝

Ottimo prodotto. Lavora molto bene e finalmente hanno pensato anche alla comodità della pulizia. Avendo un acquario da 150lt che si erge molto in altezza essendo cubico, non era comodo x me smontare sempre dei filtri. Questo,si apre coperchio superiore e si sfilano delle strisce contenenti il materiale filtrante: perfetto! Poi la potenza,spettacolo: la si può modificare a piacimento e avendo axolotl non posso tenerlo alla massima potenza perche viene disturbato ma il filtro pulisce bene e velocemente la vasca nonostante l'ho depotenziato. Io mi sento di consigliarlo

12.07.2026

T**N

Good product and fast delivery

I'm very happy with the Fluval U4 and it was delivered quick. However the top piece was already broken when I opened it and it smelled kind of used? I do not know how to contact the seller but i prefer it a bit broken then send it back etc. so I keep it like this. Fast delivery which amazed me!

27.12.2021

H**E

Fluval U4

Excellent filtre, très facile à nettoyer.

11.07.2026

E**L

Harika

Tek kelimeyle harika almadan önce cok kararsızdım iyikide almışım cok sessiz ve kaliteli bir ürün

8.03.2025

R**I

Defective Item

A defective item was delivered. I’ve been waiting for over a week for it to arrive in KSA

27.02.2026

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R2167

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Africa.

Secure transaction

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