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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💧 Elevate your aquarium game with whisper-quiet, precision filtration!

SILENT EFFICIENCY - Operate your aquarium without the noise distraction
CUSTOM FLOW CONTROL - 3-way adjustable output tailored to your tank’s needs
TRIPLE STAGE PURITY - Foam, poly/carbon cartridge & biomax for crystal-clear water
PLUG PLAY SIMPLICITY - Easy installation and maintenance for busy pros
VERSATILE COMPATIBILITY - Perfect for 34-65 gallon fresh, marine, or reptile tanks

The Fluval U4 Underwater Filter delivers advanced 3-stage filtration—foam for debris, poly/carbon for clarity, and biomax for biological balance—ensuring pristine water quality in 34-65 gallon tanks. Designed for silent, efficient operation with adjustable flow control, it’s the ideal solution for fresh, marine, or reptile environments where external filtration isn’t an option.

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Brand	Fluval
Power Source	Corded Electric
Item Weight	1.12 Kilograms
Model Name	HAGEN FLUVAL U4 UNDERWATER FILTER
Supported Water TDS Level Maximum (PPM)	350
UPC	015561104807 764999862437 155611048009 015561104784 015561104876 081175371515
Global Trade Identification Number	00015561104807
Manufacturer	Rolf C. Hagen (USA) Corp., Rolf C. Hagen (USA) Corp.
Department	men, women
Manufacturer	Rolf C. Hagen (USA) Corp.
Country of Origin	Italy
Item model number	A480A1
Product Dimensions	11.68 x 13.21 x 35.56 cm; 1.12 kg
ASIN	B001XRXY1G

Fluval U4 Underwater Filter

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