--- product_id: 48844432 title: "Genuine U4 Underwater Filter Media Poly/Carbon Cartridge 2pk" brand: "fluval" price: "AR$38212" currency: ARS in_stock: true reviews_count: 13 url: https://www.desertcart.com.ar/products/48844432-genuine-u4-underwater-filter-media-poly-carbon-cartridge-2pk store_origin: AR region: Argentina --- # 4-week cartridge lifespan Dual-layer filtration Removes toxins & odors Genuine U4 Underwater Filter Media Poly/Carbon Cartridge 2pk **Brand:** fluval **Price:** AR$38212 **Availability:** ✅ In Stock ## Summary > 💧 Elevate your aquarium game with crystal-clear confidence! ## Quick Answers - **What is this?** Genuine U4 Underwater Filter Media Poly/Carbon Cartridge 2pk by fluval - **How much does it cost?** AR$38212 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.com.ar](https://www.desertcart.com.ar/products/48844432-genuine-u4-underwater-filter-media-poly-carbon-cartridge-2pk) ## 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 - • **Smart Replacement Cycle:** Replace every 4 weeks to maintain peak filtration efficiency and avoid buildup of contaminants—never miss a refresh. - • **Tailored Fit for Fluval U4:** Precision-engineered cartridges ensure seamless compatibility and optimal performance with your Fluval U4 internal filter. - • **Crystal Clear Water, Always:** Dual-action polyester and activated carbon media traps debris and eliminates discoloration for pristine aquarium clarity. - • **Advanced Chemical Filtration:** Activated carbon absorbs harmful dissolved substances, improving water quality and creating a safer habitat for your fish. - • **Effortless Aquarium Maintenance:** Continuous filtration reduces waste buildup, cutting down your cleaning time and keeping your aquatic environment healthier. ## Overview The Fluval Genuine U4 Underwater Filter Media Poly/Carbon Cartridge 2-pack combines fine polyester filtration with activated carbon to remove debris, toxins, and odors, ensuring crystal-clear water. Designed specifically for Fluval U4 internal filters, these cartridges optimize filtration performance and reduce maintenance, with a recommended replacement every 4 weeks. ## Description Product Description Replacement Poly-Carb filter cartridge for Fluvals U series of internal filters. The polyester side filters out fine debris and contaminants. The carbon section filters out harmful liquid substances from the water, such as colorants or toxins. It effectively produces crystal clear water and reduces odours and water toxicity. It is worth noting that the carbon will also strip out most fish medications and treatments so you should remove the carbon if you need to treat the fish for any illness. The filter cartridge helps reduce overall aquarium maintenance. These cartridges should be replaced approximately every 4 weeks, each pack contains 2 cartridges. Sold in 3 different sizes for the U4 filters. Directions Remove old cartridge, insert new Fluval U4 Poly-Carb cartridge, and restart the filter. P.when('A').execute(function(A) { A.on('a:expander:toggle_description:toggle:collapse', function(data) { window.scroll(0, data.expander.$expander[0].offsetTop-100); }); }); Box Contains Cartridge See more ## Features - The Fluval Poly-Carb Filter Cartridge combines fine polyester filtration media and activated carbon to remove debris, impurities and dissolved contaminants, helping to maintain a healthier aquarium environment. - The polyester layer traps fine particles and waste, while the activated carbon helps remove discolouration, toxins and unwanted odours, leaving your aquarium water crystal clear and fresh. - Advanced chemical filtration media helps absorb harmful dissolved substances from the water, improving water quality and creating safer conditions for tropical, freshwater and marine fish. - Designed specifically for Fluval U4 Internal Filters, these replacement cartridges fit perfectly for optimal filtration performance. Each pack contains 2 replacement cartridges. - Helps reduce overall aquarium maintenance by continuously removing waste and contaminants. For best results, replace every 4 weeks. Note: Activated carbon may remove fish medications and treatments, so cartridges should be removed during aquarium treatment periods. ## Technical Specifications | Specification | Value | |---------------|-------| | Asin | B001XRVX8C | | Best Sellers Rank | 6,513 in Pet Supplies (See Top 100 in Pet Supplies) 32 in Aquarium Filter Accessories | | Brand Name | Fluval | | Country Of Origin | China | | Customer Reviews | 4.7 4.7 out of 5 stars (1,937) 4.7 out of 5 stars | | Global Trade Identification Number | 00015561104920 | | Included Components | Fluval U4 Poly-Carb Cartridge, Replacement Underwater Aquarium Filter Media, 2-Pack, A492 | | Item Form | Cartridge | | Item Type Name | U4 Poly/Carbon Cartridge (2pcs) | | Item Weight | 0.03 Kilograms | | Manufacturer | Rolf C Hagen UK Ltd | | Manufacturer Part Number | A492 | | Model Number | A492 | | Number Of Items | 1 | | Number Of Packs | 2 | | Pet Type | Fish, Reptile | | Target Species | Fish | | Unit Count | 1.0 count | | Upc | 015561104920 | ## Product Details - **Brand:** Fluval - **Item form:** Cartridge - **Item weight:** 0.03 Kilograms - **Number of Packs:** 2 - **Unit count:** 1.0 count ## Images ![Genuine U4 Underwater Filter Media Poly/Carbon Cartridge 2pk - Image 1](https://m.media-amazon.com/images/I/519t8soBffL.jpg) ## Available Options This product comes in different **Size Name, Style Name** options. ## Questions & Answers **Q: Do the u3 and u4 use the same?** A: The u4 is longer than the u3 cartridge , you could use a u3 in a u4 but it would just be a bit short in the cage that holds it **Q: Do the u3 and u4 use the same?** A: No they are different sizes, hope that answers your question **Q: how many poly/carbon cartridges in a box?** A: Hi there are two carbon cartridges in the box. I find them a great asset to my tank and keep it clean. **Q: Is this for an internal U4 filter** A: Yes ## Customer Reviews ### ⭐⭐⭐⭐⭐ Fantastic Fluval *by on Reviewed in the United Kingdom 17 September 2024* The filter cartridge arrived promptly the next day to be used in my newly set up fish tank. I was given a used filter from a friend and decided to use new cartridges and media inside. Once out of the pack the quality of the filter is excellent and so easy to install and fit inside of the filter housing. The top unclips which makes it so easy to remove and then clean. Since it has been in use the fish are all happy and healthy so it is doing exactly as it is meant to function. Money well spent on a quality product. ### ⭐⭐⭐⭐⭐ Quality *by on Reviewed in the United Kingdom 11 April 2025* Quality part for a quality product ### ⭐⭐⭐⭐⭐ Good price excellent correspondence *by on Reviewed in the United Kingdom 15 March 2023* Good price excellent correspondence. Arrived flat to save on postage..fantastic will use again ## Frequently Bought Together - Fluval U4 Filter Carbon Cartridge - Fluval U4 Internal Filter Foam Pad - Fluval U Internal Filters Clean and Clear Cartridge, White --- ## 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.com.ar/products/48844432-genuine-u4-underwater-filter-media-poly-carbon-cartridge-2pk](https://www.desertcart.com.ar/products/48844432-genuine-u4-underwater-filter-media-poly-carbon-cartridge-2pk) --- *Product available on Desertcart Argentina* *Store origin: AR* *Last updated: 2026-09-24*