--- product_id: 2333775 title: "Fluval U3 Underwater Filter" brand: "fluval" price: "4548274₫" currency: VND in_stock: true category: "Fluval" url: https://www.desertcart.vn/products/2333775-fluval-u3-underwater-filter store_origin: VN region: Vietnam --- # 3-stage filtration system Flip-top cartridge access 3-way customizable flow control Fluval U3 Underwater Filter **Brand:** fluval **Price:** 4548274₫ **Availability:** ✅ In Stock ## Summary > 🧜‍♂️ Elevate your aquarium game with Fluval U3 — where innovation meets effortless aquatic perfection! ## Quick Answers - **What is this?** Fluval U3 Underwater Filter by fluval - **How much does it cost?** 4548274₫ with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/2333775-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 - • **Flow Your Way:** Three-way flow control lets you customize water currents—horizontal for waterfalls or vertical for dynamic circulation. - • **Sleek & Functional:** Modern, ergonomic design with easy-grip water control panel blends seamlessly into any aquatic setup. - • **Triple-Stage Purity:** Advanced 3-stage filtration traps debris, clarifies water, and boosts biological efficiency for crystal-clear tanks. - • **Effortless Maintenance:** Flip-top lid design means quick, no-fuss cartridge changes—keep your aquarium pristine without the hassle. - • **Versatile Compatibility:** Perfectly engineered for freshwater, saltwater, and reptile tanks up to 40 gallons—one filter, endless possibilities. ## Overview The Fluval U3 Underwater Filter offers a powerful 3-stage filtration system with BioMax media, designed for aquariums and reptile tanks up to 40 gallons. Featuring a sleek design, customizable 3-way flow control, and a convenient flip-top lid for easy cartridge replacement, it supports freshwater, saltwater, and terrarium environments. Backed by a 3-year warranty, the U3 combines cutting-edge technology with user-friendly maintenance to keep your aquatic ecosystem thriving. ## Description Fluval U3 Underwater Filter is ideal for use in all aquarium or reptile environments. Use the underwater filter as a primary filter in smaller aquariums or as a supplementary filter for larger aquariums. Fluval Underwater Filters with three-stage filtration are ideal for use in fresh, marine or reptile environments, and are also great for tanks with low water levels. Three-stage filtration with BioMax for superior aquarium water quality, flip-top access for quick and easy cartridge replacement, and three-way flow control make the new Fluval U Series the benchmark in underwater filtration. Stage 1 foam removes large particles. In stage 2, the poly/carbon cartridge traps fine debris, improves water clarity and removes impurities. In stage 3, BioMax provides optimal biological filtration efficiency. For more fish tank accessories, check out other Fluval products including aquarium filters, aquarium heaters, aquarium air pumps, aquarium lights, aquarium rocks, aquarium thermometers, and aquarium stands. Fluval has a wide variety of products that are perfect for your pet fish to enjoy in any large fish tank, small fish tank, saltwater tank or freshwater tank. Fluval broke onto the aquatic scene in 1975 by introducing the world’s first 3-stage filter with synchronous motor technology – a breakthrough that is still applied in the industry today. Since then, Fluval has built a legacy around this pioneering spirit, relentlessly adapting in a changing world to launch innovative aquarium products that remain at the forefront of technology, and which set the bar in quality, style and functionality. Fluval’s mission is not just about building products that mimic the natural world, but inspiring aquarists of all skill levels to enjoy and respect the hobby for generations to come. ## Features - Use as a primary filter for smaller aquariums, or supplementary filter for larger aquariums - Sleek design with easy grip water control panel and redesigned media cartridge to trap more debris - Convenient flip-top lid allows for quick and easy access to filter cartridge for maintenance or replacement - Position horizontally for shallow tanks, larger tanks with low water levels, or to create a decorative waterfall feature or vertically against aquarium wall to create currents or customized flow patterns - Designed for freshwater, saltwater and reptile environments up to 40 gallons ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B001TKZ51E | | Best Sellers Rank | #15,818 in Pet Supplies ( See Top 100 in Pet Supplies ) #107 in Aquarium Filters #112 in Aquarium Filter Accessories | | Brand Name | Fluval | | Color | Black | | Customer Reviews | 4.0 4.0 out of 5 stars (2,156) | | Global Trade Identification Number | 00015561104753 | | Included Components | Filter | | Item Dimensions L x W x H | 12"L x 6"W x 5"H | | Item Highlight | Designed for Freshwater and Saltwater Aquariums, Also Ideal for Terrariums and Turtle Tanks | | Item Type Name | HAGEN FLUVAL U3 UNDERWATER FILTER | | Item Weight | 16 ounces | | Manufacturer | Rolf C. Hagen (USA) Corp. | | Manufacturer Part Number | A475A1 | | Material Type | Electronic Components, Plastic | | Model Number | A475A1 | | Number of Items | 1 | | Number of Packs | 1 | | Pet Type | Fish, Reptile | | Product Style | Underwater Filter | | Specific Uses For Product | Indoor | | Tank Volume | 40 gallons | | UPC | 015561104753 | | Unit Count | 1 Count | | Vivarium Type | Aquarium | | Warranty Description | 3 years; Fluval U Series Power Filters are guaranteed against defects in material or workmanship under normal aquarium usage and service for 3 years. We offer a 3 year guarantee on all nonreplaceable parts which means that the filter will be repaired or replaced at the manufacturer's discretion, free of charge, when the complete pump is returned with proof of purchase and postage paid. This warran… | ## Product Details - **Brand:** Fluval - **Color:** Black - **Included Components:** Filter - **Item Weight:** 16 ounces - **Material:** Electronic Components, Plastic - **Product Dimensions:** 12"L x 6"W x 5"H - **Specific Uses For Product:** Indoor - **Style:** Underwater Filter - **Tank Volume:** 40 gallons - **UPC:** 015561104753 ## Images ![Fluval U3 Underwater Filter - Image 1](https://m.media-amazon.com/images/I/41752UsyXBL.jpg) ![Fluval U3 Underwater Filter - Image 2](https://m.media-amazon.com/images/I/31w32eDG8mL.jpg) ![Fluval U3 Underwater Filter - Image 3](https://m.media-amazon.com/images/I/41O4A+9LBuL.jpg) ![Fluval U3 Underwater Filter - Image 4](https://m.media-amazon.com/images/I/41wqnwGAtPL.jpg) ![Fluval U3 Underwater Filter - Image 5](https://m.media-amazon.com/images/I/41V6WgT24zL.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 U3 Underwater Filter – Designed for Freshwater and Saltwater Aquariums, Also Ideal for Terrariums and Turtle Tanks - Nosiny 20 Pieces Filter Foam Pad Compatible with Fluval U3 Underwater Sponge Aquarium Underwater Filter Accessories Compatible for Aquarium, Fish Tank - Fluval U3 Underwater Filter Poly/Carbon --- ## 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.vn/products/2333775-fluval-u3-underwater-filter](https://www.desertcart.vn/products/2333775-fluval-u3-underwater-filter) --- *Product available on Desertcart Vietnam* *Store origin: VN* *Last updated: 2026-09-13*