--- product_id: 2221488 title: "U4 Poly Cartridge, Replacement Underwater Aquarium Filter Media, 2-Pack, A492" brand: "fluval" price: "S$20" currency: SGD in_stock: true reviews_count: 13 url: https://www.desertcart.sg/products/2221488-u4-poly-cartridge-replacement-underwater-aquarium-filter-media-2-pack store_origin: SG region: Singapore --- # 3 adjustable flow settings Easy cartridge replacement Made in USA quality U4 Poly Cartridge, Replacement Underwater Aquarium Filter Media, 2-Pack, A492 **Brand:** fluval **Price:** S$20 **Availability:** βœ… In Stock ## Summary > 🐠 Elevate your aquarium game with whisper-quiet, invisible filtration! ## Quick Answers - **What is this?** U4 Poly Cartridge, Replacement Underwater Aquarium Filter Media, 2-Pack, A492 by fluval - **How much does it cost?** S$20 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/2221488-u4-poly-cartridge-replacement-underwater-aquarium-filter-media-2-pack) ## 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 - β€’ **Proven Performance:** Field-tested and highly rated by thousands, ensuring crystal-clear water and a thriving aquatic environment. - β€’ **Seamless Integration:** Sleek underwater design eliminates bulky external filters, preserving your tank’s aesthetic and maximizing space. - β€’ **Effortless Maintenance:** Quick-swap cartridges make filter upkeep a breeze, so you spend more time enjoying your aquarium and less on chores. - β€’ **Customizable Flow Control:** Three distinct current settings to optimize oxygenation and water circulation tailored to your aquatic ecosystem. - β€’ **Premium USA Craftsmanship:** Engineered with top-tier materials for unmatched durability and performance. ## Overview The Fluval U4 Poly-Carb Cartridge 2-Pack offers premium, USA-made replacement filter media designed for the Fluval U4 underwater aquarium filter. Featuring three adjustable flow settings, it ensures optimal water quality and oxygenation while maintaining a sleek, low-profile look that fits flush with your tank. Easy to replace and highly rated by users, it’s the perfect upgrade for professional aquarists seeking efficient, quiet, and visually unobtrusive filtration. ## Description Fluval U4 Poly-Carb Cartridge, Replacement Underwater Aquarium Filter Media, 2-Pack, A492 Review: Great filter - Absolutely love the fluval filter! It's incredibly efficient at keeping my tank clean and maintaining optimal water quality for my axolotls. Setup was super easy and fast, which is a huge plus. Definitely recommend it to anyone looking for a reliable and effective filtration system for their aquarium. Review: NIce filter and lacks the visual eyesore most filters create outside the tank. - This filter is quiet and the 3 current settings are great to provide oxygen and a little action for the fish inside to all areas of the tank. I have four 4-6 inch oscars and two plecostomus in a 55 gallon tank and they have been much livelier since we got this filter. I have no room in the back of my aquarium, its almost flush with the wall, for traditional filters and my two hoods have premade cuts for openings but since I have this filter there is no need to use them. I just used some plants to cover the filter from view inside the tank and all in all, my aquarium looks great and my fish love it. I definitely recommend buying this product if you don't want or cant have a traditional filter on the lip of the aquarium tank. ## Features - Made in the USA with quality materials - Performance driven at affordable prices - Field tested to ensure nothing but the best for your pet - Easy to replace ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B001XRVX8C | | Allergen Information | Nut Free | | Best Sellers Rank | #30,580 in Pet Supplies ( See Top 100 in Pet Supplies ) #321 in Aquarium Filter Accessories | | Brand | Fluval | | Brand Name | Fluval | | Customer Reviews | 4.7 out of 5 stars 1,946 Reviews | | 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 | Fluval U4 Poly-Carb Cartridge, Replacement Underwater Aquarium Filter Media, 2-Pack, A492 | | Item Weight | 0.03 Kilograms | | Manufacturer | Rolf C. Hagen (USA) Corp. | | Manufacturer Part Number | A492 | | Model Number | A492 | | Number of Packs | 2 | | Pet Type | Fish | | Target Species | Fish | | UPC | 015561104920 | | Unit Count | 1 Count | | Warranty Description | Warranty | ## Product Details - **Brand:** Fluval - **Item Form:** Cartridge - **Item Weight:** 0.05 Kilograms - **Manufacturer:** Rolf C. Hagen (USA) Corp. - **UPC:** 015561104920 ## Images ![U4 Poly Cartridge, Replacement Underwater Aquarium Filter Media, 2-Pack, A492 - Image 1](https://m.media-amazon.com/images/I/519t8soBffL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great filter *by J***K on March 14, 2024* Absolutely love the fluval filter! It's incredibly efficient at keeping my tank clean and maintaining optimal water quality for my axolotls. Setup was super easy and fast, which is a huge plus. Definitely recommend it to anyone looking for a reliable and effective filtration system for their aquarium. ### ⭐⭐⭐⭐⭐ NIce filter and lacks the visual eyesore most filters create outside the tank. *by G***7 on August 14, 2013* This filter is quiet and the 3 current settings are great to provide oxygen and a little action for the fish inside to all areas of the tank. I have four 4-6 inch oscars and two plecostomus in a 55 gallon tank and they have been much livelier since we got this filter. I have no room in the back of my aquarium, its almost flush with the wall, for traditional filters and my two hoods have premade cuts for openings but since I have this filter there is no need to use them. I just used some plants to cover the filter from view inside the tank and all in all, my aquarium looks great and my fish love it. I definitely recommend buying this product if you don't want or cant have a traditional filter on the lip of the aquarium tank. ### ⭐⭐⭐⭐⭐ Works great! *by L***S on April 25, 2025* Works great! ## 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? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.sg/products/2221488-u4-poly-cartridge-replacement-underwater-aquarium-filter-media-2-pack](https://www.desertcart.sg/products/2221488-u4-poly-cartridge-replacement-underwater-aquarium-filter-media-2-pack) --- *Product available on Desertcart Singapore* *Store origin: SG* *Last updated: 2026-07-24*