--- product_id: 48127516 title: "FLUVAL U4 Internal Filter, 240 Litre" brand: "fluval" price: "€ 174.96" currency: EUR in_stock: true reviews_count: 13 category: "Fluval" url: https://www.desertcart.be/products/48127516-fluval-u4-internal-filter-240-litre store_origin: BE region: Belgium --- # 3-stage filtration system Top access for easy maintenance 1000 L/h max flow rate FLUVAL U4 Internal Filter, 240 Litre **Brand:** fluval **Price:** € 174.96 **Availability:** ✅ In Stock ## Summary > 💧 Elevate your aquarium game with clarity and control! ## Quick Answers - **What is this?** FLUVAL U4 Internal Filter, 240 Litre by fluval - **How much does it cost?** € 174.96 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.be](https://www.desertcart.be/products/48127516-fluval-u4-internal-filter-240-litre) ## 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 - • **Whisper-Quiet Power:** Operate your aquarium with near-silent 1000 L/h flow—peaceful for you, perfect for your fish. - • **Effortless Maintenance:** Top-access design means quick, hassle-free filter changes—no more tank disruptions or mess. - • **Sleek & Discreet Design:** Compact, metal build blends seamlessly into your tank setup, elevating your aquarium’s aesthetic without bulk. - • **Crystal Clear Water, Fast:** Advanced 3-stage filtration with activated carbon and ceramic media ensures sparkling clarity and healthy water quality. - • **Customizable Flow Control:** Adjust between top, middle, or bottom spray modes to create the ideal water movement for your aquatic ecosystem. ## Overview The FLUVAL U4 Internal Filter is a high-performance aquarium filter designed for tanks up to 240 litres. Featuring a powerful 1000 L/h flow rate, adjustable spray modes, and a 3-stage filtration system with activated carbon and ceramic media, it delivers crystal-clear water with whisper-quiet operation. Its top-access design simplifies maintenance, making it a favorite among aquarium enthusiasts seeking both efficiency and style. ## Description From the manufacturer Fluval U Internal Filter 3-stage filtration Level 1: Foam removes large dirt particles Level 2: Polyester/activated carbon filter insert - traps small particles, improves water purity and removes odours Level 3: BioMax - offers an optimal, biological balance (Fluval U1 only provides level 1) Flip top Hinged access for quick and easy filter media change Integrated nozzle jet tube Provides an even, gentle flow for planted aquariums (Fluval U1 provides top outlet only) Upper and lower outlet Upper Outlet For maximum circulation and oxygen enrichment Bottom Outlet For water currents on the aquarium substrate Suitable for freshwater and saltwater aquariums, terrariums and turtle tanks Quiet and efficient Developed and produced in Italy Ideal for use as a stand-alone solution or supplementary filter or where an external filter insert is not possible Can also be placed horizontally in the shallow water basin to create decorative facilities such as waterfalls Ideal for underwater placement to train individually adjustable flow patterns Review: Must have ! - Best in tank filter I’ve had. Bought as original tank filter went down in my 130l , the pros of this filter are - -super quite , hardly any noise -smart looking / blends in / fits nicely -3 different spray modes (top , bottom or middle for gentle flow) So easy to use / setup and for maintenance The water is really really clear with the active carbon in the filter , it comes with ceramic media too which is a bonus Overall really good filter , highly recommend this in tank instead of external canister Review: Amazing filter top marks all round - We bought this as the filter we had was not doing a great job water was never crystal clear. Bought the u2 and over night the water was clear. The pictures added to this review are from this weekends water change/aqua scaping. The water got super cloudy due moving the sand about. With in a few hour a noticeable difference. This morning the tank was crystal clear. Out water is dark due to new wood tanens being in the water. But the water its self is beautifully clear. Quiet filter and easy to use. It is quite a big filter. We have ours hidden behind some wood. The three settings for bottom middle or top flow is great to have. Easily removed for filter changes. I cant recommend high enough. You can feel the quality. If you order this get a eu to uk convertor plug as mine came as an eu plug and not a uk one. Wasnt an expensive add. Even that doesn’t take away for how great the filter is ## Features - Warning:Not suitable for children under 3 years. For use under adult supervision - Top Access - for easy maintenance - Adjustable flow control - 3 Stage Filtration ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B001XRXY1G | | Best Sellers Rank | 4,736 in Pet Supplies ( See Top 100 in Pet Supplies ) 11 in Aquarium Filters | | Brand | Fluval | | Capacity | 240 litres | | Container Type | Filtration container | | Customer Reviews | 4.3 out of 5 stars 8,003 Reviews | | Global Trade Identification Number | 00015561104807 | | Included Components | Filter | | Included components | Filter | | Installation Type | Freestanding | | Installation type | Freestanding | | Item Type Name | HAGEN FLUVAL U4 UNDERWATER FILTER | | Item Weight | 1.12 Kilograms | | Manufacturer | HAGEN | | Manufacturer Part Number | HGA480 | | Material | Metal | | Material Type | Metal | | Maximum Flow Rate | 1000 Litres Per Hour | | Model Name | Fluval A Filtro Interno U | | Model Number | A480A1 | | Package information | Filtration container | | Power Source | Corded Electric | | Product Warranty | FALSE | | Purification Method | Biological Filtration | | Smart Home Compatibility | Not Smart Home Compatible | | Supported Water TDS Level Maximum (PPM) | 350 | | UPC | 015561104807 764999862437 155611048009 015561104784 081175371515 | | Unit Count | 1 count | | Upper Temperature Rating | 80 Degrees Fahrenheit | ## Product Details - **Brand:** Fluval - **Capacity:** 240 litres - **Included components:** Filter - **Installation type:** Freestanding - **Item weight:** 1.12 Kilograms - **Material:** Metal - **Model name:** Fluval A Filtro Interno U - **Package information:** Filtration container - **Power source:** Battery Powered - **Purification method:** Biological filtration, activated carbon ## Images ![FLUVAL U4 Internal Filter, 240 Litre - Image 1](https://m.media-amazon.com/images/I/41T6Zfskp5L.jpg) ![FLUVAL U4 Internal Filter, 240 Litre - Image 2](https://m.media-amazon.com/images/I/519+9qLRuCL.jpg) ![FLUVAL U4 Internal Filter, 240 Litre - Image 3](https://m.media-amazon.com/images/I/51Lo1ZDpAfL.jpg) ![FLUVAL U4 Internal Filter, 240 Litre - Image 4](https://m.media-amazon.com/images/I/515zW-PSyTL.jpg) ![FLUVAL U4 Internal Filter, 240 Litre - Image 5](https://m.media-amazon.com/images/I/51qIoV6D6lL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: Does the whole unit go under water? No spray bar to make a noise? All the aeration underwater bubbles? My filter at the moment very noisy!** A: its very quiet, just a small hum if you get near it. It has 3 settings, one makes bubbles, the other ones are silent, you dont have to have the bubbles if the unit is under water, mine is just above the surface, i dont like to trail the wire in the water but some people do and the unit can sit in the bottom of the tank, it is large but a few plants will cover it, hope this helps **Q: Hi does the filer come ready to use or do I have to buy the filters and foam seperately?** A: Hi Leigh.It comes with the filters and biomax filter media :-) I get my refills from Amazon seller The Aquahut for £11.59 for a 2 pack foam pad, 2 pack cartridge pack and 170g box of biomax. Good value and very reliable seller. Have used them ever since I purchased my Fluval U2. Happy to help :-) **Q: I have lost the grey stopper that regulate the slow from the top filter. Is it possible to purchase these separately please?** A: You can use a blob of bluetac and vary the air flow like that. **Q: Will this filter work if I use it horizontally on its side, rather than vertically? I want to use it in my turtle tank which has a low water level** A: I can’t see it being a problem. How deep is your water though? This is enough filtration for a 110l tank so if you’ve only got a bit of water in the bottom a sponge filter may be a better option? ## Customer Reviews ### ⭐⭐⭐⭐⭐ Must have ! *by T***E on 29 December 2025* Best in tank filter I’ve had. Bought as original tank filter went down in my 130l , the pros of this filter are - -super quite , hardly any noise -smart looking / blends in / fits nicely -3 different spray modes (top , bottom or middle for gentle flow) So easy to use / setup and for maintenance The water is really really clear with the active carbon in the filter , it comes with ceramic media too which is a bonus Overall really good filter , highly recommend this in tank instead of external canister ### ⭐⭐⭐⭐⭐ Amazing filter top marks all round *by S***Y on 1 July 2025* We bought this as the filter we had was not doing a great job water was never crystal clear. Bought the u2 and over night the water was clear. The pictures added to this review are from this weekends water change/aqua scaping. The water got super cloudy due moving the sand about. With in a few hour a noticeable difference. This morning the tank was crystal clear. Out water is dark due to new wood tanens being in the water. But the water its self is beautifully clear. Quiet filter and easy to use. It is quite a big filter. We have ours hidden behind some wood. The three settings for bottom middle or top flow is great to have. Easily removed for filter changes. I cant recommend high enough. You can feel the quality. If you order this get a eu to uk convertor plug as mine came as an eu plug and not a uk one. Wasnt an expensive add. Even that doesn’t take away for how great the filter is ### ⭐⭐⭐⭐⭐ Value for money *by M***S on 8 May 2026* We have just replaced the same one which we had for 5 years ,really good product ## Frequently Bought Together - Fluval U4 Underwater Filter, Freshwater and Saltwater Aquarium Filter, A480,Black - Fluval U4 Bio-Foam Pad, Replacement Underwater Aquarium Filter Media, A488 - Fluval U Underwater Filter BioMax --- ## 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.be/products/48127516-fluval-u4-internal-filter-240-litre](https://www.desertcart.be/products/48127516-fluval-u4-internal-filter-240-litre) --- *Product available on Desertcart Belgium* *Store origin: BE* *Last updated: 2026-05-25*