---
product_id: 2858745
title: "Fluval U3 Underwater Filter"
brand: "fluval"
price: "€ 18.64"
currency: EUR
in_stock: true
reviews_count: 13
category: "Fluval"
url: https://www.desertcart.fr/products/2858745-fluval-u3-underwater-filter
store_origin: FR
region: France
---

# Versatile freshwater & marine use Effective chemical filtration Custom fit precision Fluval U3 Underwater Filter

**Brand:** fluval
**Price:** € 18.64
**Availability:** ✅ In Stock

## Summary

> 💧 Keep your aquatic world flawlessly fresh — because your tank deserves the best!

## Quick Answers

- **What is this?** Fluval U3 Underwater Filter by fluval
- **How much does it cost?** € 18.64 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fr](https://www.desertcart.fr/products/2858745-fluval-u3-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

- • **Compact & Lightweight:** At just 2.5 x 2.5 x 1.3 inches and under 1 ounce, it fits discreetly without disrupting your tank’s aesthetic.
- • **Seamless Compatibility:** Tailored specifically for the Fluval U3 filter for effortless installation and peak performance.
- • **Trusted by Enthusiasts:** Join thousands of satisfied users who keep their aquatic ecosystems pristine with Fluval’s proven reliability.
- • **Multi-Environment Ready:** Perfectly engineered to support freshwater, marine, and reptile habitats—one filter, endless possibilities.
- • **Advanced Chemical Filtration:** Poly/Carbon media ensures crystal-clear water by removing impurities and odors effectively.

## Overview

The Fluval U3 Underwater Filter Poly/Carbon insert is a precision-engineered replacement filter designed exclusively for the Fluval U3 system. It delivers superior chemical filtration suitable for freshwater, marine, and reptile tanks, ensuring clean, healthy water. Compact and lightweight, it offers easy installation and maintenance, backed by a strong reputation among aquarium enthusiasts.

## Description

Fluval U3 Underwater Filter Poly/Carbon

Review: Love fluval! - Love these filters they keep my turtle aquarium as clean as can be until I have to purchase more! Love fluval products!!
Review: Turtle filter - Filter works well for smaller turtle tanks.

## Features

- Easy to replace
- Custom fit for the Fluvial U3 Filter
- Provides effective chemical filtration
- Works in freshwater, marine or reptile environments

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B001XRR3E0 |
| ASIN  | B001XRR3E0 |
| Age Range Description | All Life Stages |
| Best Sellers Rank | #21,953 in Pet Supplies ( See Top 100 in Pet Supplies ) #210 in Aquarium Filter Accessories |
| Brand Name | Fluval |
| Color | White |
| Customer Reviews | 4.6 4.6 out of 5 stars (1,286) |
| Date First Available | September 7, 2010 |
| Date First Available  | September 7, 2010 |
| Department | Unisex-Adult |
| Department  | Unisex-Adult |
| Directions | Use as directed on packaging |
| Included Components | Fluval U3 Underwater Filter Poly/Carbon |
| Is Discontinued By Manufacturer  | No |
| Item Dimensions LxWxH | 2.5 x 2.5 x 1.3 inches |
| Item Package Dimensions L x W x H | 8.74 x 2.52 x 1.46 inches |
| Item Weight | 0.03 Kilograms |
| Item model number | A491 |
| Item model number  | A491 |
| Manufacturer | Rolf C. Hagen (USA) Corp. |
| Manufacturer  | Rolf C. Hagen (USA) Corp. |
| Material | Plastic |
| Model Name | Fluval U3 Underwater Filter Poly/Carbon |
| Number of Items | 1 |
| Product Dimensions  | 2.5 x 2.5 x 1.3 inches; 0.92 ounces |
| Size | 1 Count (Pack of 1) |
| Specific Uses for Product | Indoor |
| Style | Poly/Carbon Insert |
| Target Audience Keyword | fish |
| Warranty Description | Warranty |

## Product Details

- **Brand:** Fluval
- **Item Form:** Cartridge
- **Item Weight:** 0.03 Kilograms
- **Manufacturer:** Rolf C. Hagen (USA) Corp.
- **UPC:** 015561104913

## Images

![Fluval U3 Underwater Filter - Image 1](https://m.media-amazon.com/images/I/41pxTmVeEXL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Love fluval!
*by J***T on November 22, 2025*

Love these filters they keep my turtle aquarium as clean as can be until I have to purchase more! Love fluval products!!

### ⭐⭐⭐⭐⭐ Turtle filter
*by T***B on November 24, 2025*

Filter works well for smaller turtle tanks.

### ⭐⭐⭐⭐⭐ excellent
*by A***R on January 15, 2026*

great replacement

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---

*Product available on Desertcart France*
*Store origin: FR*
*Last updated: 2026-02-22*