---
product_id: 2858745
title: "Fluval U3 Underwater Filter"
brand: "fluval"
price: "NT$590"
currency: TWD
in_stock: true
category: "Fluval"
url: https://www.desertcart.tw/products/2858745-fluval-u3-underwater-filter
store_origin: TW
region: Taiwan
---

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

**Brand:** fluval
**Price:** NT$590
**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?** NT$590 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tw](https://www.desertcart.tw/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

## 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 |
| Allergen Information | Nut Free |
| Best Sellers Rank | #24,666 in Pet Supplies ( See Top 100 in Pet Supplies ) #236 in Aquarium Filter Accessories |
| Brand Name | Fluval |
| Customer Reviews | 4.6 4.6 out of 5 stars (1,302) |
| Date First Available  | September 7, 2010 |
| Department  | Unisex-Adult |
| Global Trade Identification Number | 00015561104913 |
| Included Components | Fluval U3 Underwater Filter Poly/Carbon |
| Is Discontinued By Manufacturer  | No |
| Item Form | Cartridge |
| Item Type Name | Fluval U3 Underwater Filter Poly/Carbon |
| Item Weight | 0.03 Kilograms |
| Item model number  | A491 |
| Manufacturer | Rolf C. Hagen (USA) Corp. |
| Manufacturer  | Rolf C. Hagen (USA) Corp. |
| Manufacturer Part Number | A491 |
| Model Number | A491 |
| Pet Type | Amphibian, Fish, Reptile |
| Product Dimensions  | 2.5 x 2.5 x 1.3 inches; 0.92 ounces |
| Target Species | Fish |
| UPC | 015561104913 |
| Unit Count | 1 Count |
| Warranty Description | Warranty |

## Product Details

- **Brand:** Fluval
- **Item Form:** Cartridge
- **Item Weight:** 0.03 Kilograms
- **Manufacturer:** Rolf C. Hagen (USA) Corp.
- **Unit Count:** 1 Count

## Images

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

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.tw/products/2858745-fluval-u3-underwater-filter](https://www.desertcart.tw/products/2858745-fluval-u3-underwater-filter)

---

*Product available on Desertcart Taiwan*
*Store origin: TW*
*Last updated: 2026-05-01*