---
product_id: 228949125
title: "U4 Underwater Filter"
brand: "fluval"
price: "1159 Lei"
currency: RON
in_stock: true
url: https://www.desertcart.ro/products/228949125-u4-underwater-filter
store_origin: RO
region: Romania
---

# Optimal biological filtration Silent & efficient operation 3-way adjustable flow control U4 Underwater Filter

**Brand:** fluval
**Price:** 1159 Lei
**Availability:** ✅ In Stock

## Summary

> 💧 Elevate your aquarium game with silent, smart filtration!

## Quick Answers

- **What is this?** U4 Underwater Filter by fluval
- **How much does it cost?** 1159 Lei with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ro](https://www.desertcart.ro/products/228949125-u4-underwater-filter)

## Best For

- fluval enthusiasts

## Why This Product

- Trusted fluval brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Tailored Flow Control:** 3-way adjustable output lets you customize water circulation for perfect aquatic harmony.
- • **Plug & Play Simplicity:** Effortless installation and maintenance save you time and hassle—focus on your aquatic masterpiece.
- • **Whisper-Quiet Performance:** Enjoy a peaceful environment with near-silent operation—no distractions, just serenity.
- • **Crystal Clear Waters, Always:** Advanced debris filtration keeps your aquarium pristine and vibrant.
- • **Perfect Fit for Mid-Sized Tanks:** Designed for 34-65 gallon aquariums, ideal for both supplemental and standalone filtration.

## Overview

The Fluval U4 Underwater Filter is a compact, freestanding filtration system designed for 34-65 gallon aquariums. It features advanced biological and mechanical filtration with 3-way adjustable flow control, operates silently, and includes foam pads, poly/carbon cartridges, and biomax media for optimal water quality. Easy to install and maintain, it’s perfect for setups where external filtration isn’t feasible.

## Description

U4 Underwater Filter

## Features

- Filters debris and provides optimal biological filtration
- Simple to install and maintain
- Silent and efficient
- Ideal supplemental or stand-alone filter or for installations where external filtration is not possible
- Comes with 3-way flow control with adjustable output, 2 foam pads, 2 poly/carbon cartridges and 90 grams biomax
- Ideal for 34-65 gallon environments

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | Fluval |
| Installation Type | Freestanding |
| 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 | India |
| Item model number | A480A1 |
| Product Dimensions | 11.68 x 13.21 x 35.56 cm; 1.12 kg |
| ASIN | B001XRXY1G |

## Product Details

- **Brand:** Fluval
- **Material:** Metal
- **Capacity:** 240 litres
- **Included Components:** Filter
- **Installation Type:** Freestanding

## Images

![U4 Underwater Filter - Image 1](https://m.media-amazon.com/images/I/41T6Zfskp5L.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: 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.**
A: 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.

**Q: Does the U4 filter have space to add activated carbon pellets?**
A: 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.

**Q: Do all 3 outputs work at the same time?**
A: 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

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

## Frequently Bought Together

- Fluval U4 Underwater Filter, Freshwater and Saltwater Aquarium Filter, A480,Black
- Fluval U4 Bio-Foam Pad, Replacement Underwater Aquarium Filter Media, A488
- Fluval U Underwater Filter BioMax

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*Product available on Desertcart Romania*
*Store origin: RO*
*Last updated: 2026-02-09*