--- product_id: 2858674 title: "Fluval U4 Underwater Filter, Freshwater & Saltwater Aquarium Filter, Black" brand: "fluval" price: "709.31 DT" currency: TND in_stock: true reviews_count: 13 category: "Fluval" url: https://www.desertcart.tn/products/2858674-fluval-u4-underwater-filter-freshwater-and-saltwater-aquarium-filter-black store_origin: TN region: Tunisia --- # 1000 L/hr max flow 3-stage filtration system Flip-top cartridge access Fluval U4 Underwater Filter, Freshwater & Saltwater Aquarium Filter, Black **Brand:** fluval **Price:** 709.31 DT **Availability:** ✅ In Stock ## Summary > 💦 Elevate your aquarium game with Fluval U4 — where clean water meets sleek control! ## Quick Answers - **What is this?** Fluval U4 Underwater Filter, Freshwater & Saltwater Aquarium Filter, Black by fluval - **How much does it cost?** 709.31 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/2858674-fluval-u4-underwater-filter-freshwater-and-saltwater-aquarium-filter-black) ## 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 - • **Effortless Maintenance:** Flip-top lid and redesigned cartridge make filter changes quick and mess-free. - • **Fresh & Saltwater Ready:** Engineered for freshwater, saltwater, and reptile tanks—your all-in-one aquatic solution. - • **Powerful 1000 L/hr Flow:** Keeps up to 65-gallon tanks crystal clear with customizable water movement. - • **Versatile Placement & Flow:** Position horizontally or vertically to create currents, waterfalls, or tailored flow patterns. - • **Advanced 3-Stage Filtration:** Foam, poly/carbon, and BioMax media trap debris, impurities, and optimize biological filtration. ## Overview The Fluval U4 Underwater Filter delivers powerful 1000 L/hr flow with a sophisticated 3-stage filtration system designed for freshwater, saltwater, and reptile tanks up to 65 gallons. Its sleek, compact design features a flip-top lid for easy cartridge changes and versatile placement options to customize water flow. Trusted by thousands, it ensures superior water clarity and optimal biological filtration, making it a must-have for serious aquarists seeking effortless maintenance and pristine aquatic environments. ## Description Fluval U4 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. Review: Used in 50 Gallon Turtle Tank - __________________________________________________________________________ UPDATED 7/26/12-- see bottom part of entry-- upgrade from 3 to 5 stars __________________________________________________________________________ Original review June 2012: I'm writing a long review because I found it helpful to hear others' experience specifically with turtles. They are a little different than fish when it comes to what works. I have a painted turtle, about 5-6 inches long right now. We have an algae eater too who helps keep the tank clean (we call it a sucker fish, not sure what its real name is). We also periodically add small minnows and goldfish to entertain the turtle and for food if we forget to feed her or go on vacation. Since she's primarily a water turtle, her tank consists of mostly water with a few haul out spots. We just upgraded from a 20G tank to this one. Previously we've always used the Whisper Quiet filters with great success. People would rave about how clean the turtle tank was, and we could pretty much ignore it (don't worry about changing water, etc.) In the 20G tank we had the 20-40G Whisper Quiet in about 16G of water, no plants, a few submerged items, and a floating plastic "log" for basking. For the 50G, we added a few more submerged and surface items, but all are plastic or rocks, nothing living. Upgrading to the 50G tank (with about 40-42G water) posed a problem for me. All of the larger hang on back filters required the water level to be higher than I wanted, since the turtle needs some land, and I didn't want it climbing out. I tried rigging a few up-- the larger Tetra one worked very well, but I had to rig it inside of the tank, and it just took up too much room. I decided to try the underwater Fluval for two reasons-- never need to worry about water level, and because I'm not willing to invest in a canister filter. PROS: --silence. it's golden --ease of changing filter media (it's really simple, you can lift it up so you don't contaminate everything or spit junk back out) --will never dry out or burn out if you lose power and it restarts (since submerged) --ability to place where I like in the tank for optimal filtering and flow to stir things up --ability to change parts of filter at a time to preserve beneficial bacteria --foam pad separate from other pieces so you can rinse that and not everything --no splashing, so no hard water stains on side of tank CONS: --I want to love this filter and I hope it works long term. We used it in a tank that had been recently filled and set up, with the Tetra running for about a week. Initially this worked really well, but about a week into it, the water turned nasty green. First off, TURTLES ARE DIRTY. By nature I don't think this filter accomodates that. I'm holding off judgement since it sometimes takes a while to get things right when you set up a new tank, as it happened before with other filters too at times. However, in this case, I think it's because of a lack of active carbon in the filter. There is just a tiny bit there, and in my experience (6 years with this turtle), the active carbon is ESSENTIAL to keeping them from getting stinky and gross. I decided to remove the bio pellets from the middle part (step 3) since I never had them before in my tanks anyway, and instead fill that space with one of the tetra filters filled with activated carbon. It's been about 10 hours. The nastiness is gone and the tank looks much better. There still seem to be a lot of particles in the water, but I am continuing to work on that-- not sure if I can blame it on the filter at this time. I will keep adjusting, because I think this filter is worth figuring out how to make it work for turtles. I gave it three stars because it advertises that it can be used for my purpose, but I don't think it comes through with the media it uses. I also think their media replacements are expensive relative to other filters (which is especially frustrating when they aren't even working for me). However, if the makeshift adjustment of using other carbon filters inside the third chamber is effective, I would upgrade to 4 stars. If I get to perfectly crystal clear water without the need to pay attention to the tank every week (yes, it's possible with some cheap filters), I'd go to 5 stars. I ask a lot from my filters! ___________________________________________ UPDATE 7/26/12 This definitely deserved the upgrade to five stars. I had to leave for three weeks after adding the Tetra carbon filter to the center in place of the bio pellets, so I filled it with a bunch of minnows for her to eat over time, then came home to a tank that was still crystal clear after 24 days. (Trust me, I was almost afraid to look at the tank when I returned for fear of how gross it might be.) A few minnows were still swimming around happily too. I went ahead and swapped out the carbon filter, but it looks like I can simply wash out the outer sponge and pathetic carbon insert supplied with it periodically and replace the Tetra carbon insert in the center chamber monthly. I still don't like that I had to adjust it, but I don't think there's a great product out there for turtles, and this is working VERY well. Plus, I am now purchasing the cheaper Tetra filters, so my ongoing costs will be less. If you go this route, it does seem like a very tight fit to fold over the Tetra filter and slip it in the middle chamber, so don't be shy. Just wiggle it as you push it in and be gentle. All that remains to be seen is longevity, but for now I am one happy consumer! Review: Awesome Upgrade for my Turtles - I have two small aquatic turtles - Texas Map Turtles; males max out at about 4 1/2 inches or so. I recently upgraded them to a larger fish aquarium rather than a shallow water turtle tank. I added the Fluval U4 and so far, after several weeks, I am so happy I "invested" in this filter. Turtles are dirty animals. They make a huge mess of their tank and turtle-parents like me are challenged to keep their water clean. A Tetra waterfall filter did an acceptable job in their shallow water tank so long as I changed the water twice a week. My first upgrade was to a fluval external filter, which was OK, but just ok. Within a few weeks I found that I was still needing to change the water more than once a week, and that the tubing, first from the tank to the filter, then also from the filter back to the spray bar which returned the filtered water to the tank, would fill with gunk which provides a lovely breeding ground for planaria and other aquarium unpleasantness. And once again, I need to emphasize that turtles are Gross. Srsly. Since adding the U4, my bad boys' water is keeping so much cleaner. This does not mean that I can just go ahead and neglect the tank! But I am truly happy that I bought them a better filter. With this filter I can have the tank filled almost to the top with water - I just need to have a low enough that the turtles can't escape the tank when they are on their basking platform (I also added an additional "guard rail" to keep them in, but that's another story entirely . . .). The water is staying cleaner, longer. I also appreciate how well the filter moves the water around the tank. The filter gives the choice of three circulation options. For the turtles, I chose the water to return from the bottom outlet for maximum agitation. Still water gets dirtier, faster, and so I am Loving this option. I noticed another review used the phrase "plug and play" for this filter. Can't say that better, and so I say it the same. I am going to actually get another of this model - but the U3, I think, for my son's fish tank. It currently has a hang on filter which I find annoying because when the water gets a bit low the filter starts sucking air - which of course says to me that it's time to give that tank some attention . . . but aside from the air-sucking thing, the hang on filter is Loud and there are no speed flow options on that particular filter. I think my son's fish will also appreciate the quiet, and they will appreciate the internal flow of the water, which I think for them might come from the top, for maximum oxygen. Five stars. Srsly. ## 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 65 gallons ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B001XRXY1G | | Best Sellers Rank | #13,682 in Pet Supplies ( See Top 100 in Pet Supplies ) #94 in Aquarium Filter Accessories #95 in Aquarium Filters | | Brand | Fluval | | Brand Name | Fluval | | Capacity | 240 liters | | Customer Reviews | 4.3 out of 5 stars 3,246 Reviews | | Global Trade Identification Number | 00015561104807 | | Included Components | Filter | | Installation Type | Underwater | | Item Dimensions L x W x H | 5.12"L x 4.72"W x 14.17"H | | Item Type Name | HAGEN FLUVAL U4 UNDERWATER FILTER | | Item Weight | 1.12 kg | | Manufacturer | Rolf C. Hagen (USA) Corp. | | Material | Metal | | Material Type | Metal | | Maximum Flow Rate | 1000 liters per hour | | Model Name | HAGEN FLUVAL U4 UNDERWATER FILTER | | Model Number | A480A1 | | Number of Items | 1 | | Number of Packs | 1 | | Part Number | HGA480 | | Power Source | Corded Electric | | Product Dimensions | 5.12"L x 4.72"W x 14.17"H | | Purification Method | Biological | | Supported Water TDS Level Maximum (PPM) | 350 | | UPC | 015561104807 764999862437 155611048009 015561104784 081175371515 | | Unit Count | 1 Count | | 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 - **Capacity:** 240 Liters - **Global Trade Identification Number:** 00015561104807 - **Included Components:** Filter - **Installation Type:** Underwater - **Item Weight:** 1.12 Kilograms - **Material:** Metal - **Model Name:** HAGEN FLUVAL U4 UNDERWATER FILTER - **Power Source:** Corded Electric - **UPC:** 015561104807 764999862437 155611048009 015561104784 081175371515 ## Images ![Fluval U4 Underwater Filter, Freshwater & Saltwater Aquarium Filter, Black - Image 1](https://m.media-amazon.com/images/I/41T6Zfskp5L.jpg) ![Fluval U4 Underwater Filter, Freshwater & Saltwater Aquarium Filter, Black - Image 2](https://m.media-amazon.com/images/I/519+9qLRuCL.jpg) ![Fluval U4 Underwater Filter, Freshwater & Saltwater Aquarium Filter, Black - Image 3](https://m.media-amazon.com/images/I/51Lo1ZDpAfL.jpg) ![Fluval U4 Underwater Filter, Freshwater & Saltwater Aquarium Filter, Black - Image 4](https://m.media-amazon.com/images/I/515zW-PSyTL.jpg) ![Fluval U4 Underwater Filter, Freshwater & Saltwater Aquarium Filter, Black - Image 5](https://m.media-amazon.com/images/I/51qIoV6D6lL.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. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Used in 50 Gallon Turtle Tank *by P***N on June 27, 2012* __________________________________________________________________________ UPDATED 7/26/12-- see bottom part of entry-- upgrade from 3 to 5 stars __________________________________________________________________________ Original review June 2012: I'm writing a long review because I found it helpful to hear others' experience specifically with turtles. They are a little different than fish when it comes to what works. I have a painted turtle, about 5-6 inches long right now. We have an algae eater too who helps keep the tank clean (we call it a sucker fish, not sure what its real name is). We also periodically add small minnows and goldfish to entertain the turtle and for food if we forget to feed her or go on vacation. Since she's primarily a water turtle, her tank consists of mostly water with a few haul out spots. We just upgraded from a 20G tank to this one. Previously we've always used the Whisper Quiet filters with great success. People would rave about how clean the turtle tank was, and we could pretty much ignore it (don't worry about changing water, etc.) In the 20G tank we had the 20-40G Whisper Quiet in about 16G of water, no plants, a few submerged items, and a floating plastic "log" for basking. For the 50G, we added a few more submerged and surface items, but all are plastic or rocks, nothing living. Upgrading to the 50G tank (with about 40-42G water) posed a problem for me. All of the larger hang on back filters required the water level to be higher than I wanted, since the turtle needs some land, and I didn't want it climbing out. I tried rigging a few up-- the larger Tetra one worked very well, but I had to rig it inside of the tank, and it just took up too much room. I decided to try the underwater Fluval for two reasons-- never need to worry about water level, and because I'm not willing to invest in a canister filter. PROS: --silence. it's golden --ease of changing filter media (it's really simple, you can lift it up so you don't contaminate everything or spit junk back out) --will never dry out or burn out if you lose power and it restarts (since submerged) --ability to place where I like in the tank for optimal filtering and flow to stir things up --ability to change parts of filter at a time to preserve beneficial bacteria --foam pad separate from other pieces so you can rinse that and not everything --no splashing, so no hard water stains on side of tank CONS: --I want to love this filter and I hope it works long term. We used it in a tank that had been recently filled and set up, with the Tetra running for about a week. Initially this worked really well, but about a week into it, the water turned nasty green. First off, TURTLES ARE DIRTY. By nature I don't think this filter accomodates that. I'm holding off judgement since it sometimes takes a while to get things right when you set up a new tank, as it happened before with other filters too at times. However, in this case, I think it's because of a lack of active carbon in the filter. There is just a tiny bit there, and in my experience (6 years with this turtle), the active carbon is ESSENTIAL to keeping them from getting stinky and gross. I decided to remove the bio pellets from the middle part (step 3) since I never had them before in my tanks anyway, and instead fill that space with one of the tetra filters filled with activated carbon. It's been about 10 hours. The nastiness is gone and the tank looks much better. There still seem to be a lot of particles in the water, but I am continuing to work on that-- not sure if I can blame it on the filter at this time. I will keep adjusting, because I think this filter is worth figuring out how to make it work for turtles. I gave it three stars because it advertises that it can be used for my purpose, but I don't think it comes through with the media it uses. I also think their media replacements are expensive relative to other filters (which is especially frustrating when they aren't even working for me). However, if the makeshift adjustment of using other carbon filters inside the third chamber is effective, I would upgrade to 4 stars. If I get to perfectly crystal clear water without the need to pay attention to the tank every week (yes, it's possible with some cheap filters), I'd go to 5 stars. I ask a lot from my filters! ___________________________________________ UPDATE 7/26/12 This definitely deserved the upgrade to five stars. I had to leave for three weeks after adding the Tetra carbon filter to the center in place of the bio pellets, so I filled it with a bunch of minnows for her to eat over time, then came home to a tank that was still crystal clear after 24 days. (Trust me, I was almost afraid to look at the tank when I returned for fear of how gross it might be.) A few minnows were still swimming around happily too. I went ahead and swapped out the carbon filter, but it looks like I can simply wash out the outer sponge and pathetic carbon insert supplied with it periodically and replace the Tetra carbon insert in the center chamber monthly. I still don't like that I had to adjust it, but I don't think there's a great product out there for turtles, and this is working VERY well. Plus, I am now purchasing the cheaper Tetra filters, so my ongoing costs will be less. If you go this route, it does seem like a very tight fit to fold over the Tetra filter and slip it in the middle chamber, so don't be shy. Just wiggle it as you push it in and be gentle. All that remains to be seen is longevity, but for now I am one happy consumer! ### ⭐⭐⭐⭐⭐ Awesome Upgrade for my Turtles *by M***L on July 12, 2012* I have two small aquatic turtles - Texas Map Turtles; males max out at about 4 1/2 inches or so. I recently upgraded them to a larger fish aquarium rather than a shallow water turtle tank. I added the Fluval U4 and so far, after several weeks, I am so happy I "invested" in this filter. Turtles are dirty animals. They make a huge mess of their tank and turtle-parents like me are challenged to keep their water clean. A Tetra waterfall filter did an acceptable job in their shallow water tank so long as I changed the water twice a week. My first upgrade was to a fluval external filter, which was OK, but just ok. Within a few weeks I found that I was still needing to change the water more than once a week, and that the tubing, first from the tank to the filter, then also from the filter back to the spray bar which returned the filtered water to the tank, would fill with gunk which provides a lovely breeding ground for planaria and other aquarium unpleasantness. And once again, I need to emphasize that turtles are Gross. Srsly. Since adding the U4, my bad boys' water is keeping so much cleaner. This does not mean that I can just go ahead and neglect the tank! But I am truly happy that I bought them a better filter. With this filter I can have the tank filled almost to the top with water - I just need to have a low enough that the turtles can't escape the tank when they are on their basking platform (I also added an additional "guard rail" to keep them in, but that's another story entirely . . .). The water is staying cleaner, longer. I also appreciate how well the filter moves the water around the tank. The filter gives the choice of three circulation options. For the turtles, I chose the water to return from the bottom outlet for maximum agitation. Still water gets dirtier, faster, and so I am Loving this option. I noticed another review used the phrase "plug and play" for this filter. Can't say that better, and so I say it the same. I am going to actually get another of this model - but the U3, I think, for my son's fish tank. It currently has a hang on filter which I find annoying because when the water gets a bit low the filter starts sucking air - which of course says to me that it's time to give that tank some attention . . . but aside from the air-sucking thing, the hang on filter is Loud and there are no speed flow options on that particular filter. I think my son's fish will also appreciate the quiet, and they will appreciate the internal flow of the water, which I think for them might come from the top, for maximum oxygen. Five stars. Srsly. ### ⭐⭐⭐⭐⭐ Quiet filter and Great for Turtles! *by G***5 on October 14, 2014* FINALLY a filter that works for turtles. This filter can mount sideways, which is great news for turtle owners who only fill the tank halfway to allow room for a turtle basking platform. Most filters are designed to draw water from the very top of a full tank. This filter can be mounted either vertically or horizontally to accommodate a lower water level. This is also the quietest filter I have ever owned. The entire filtration process occurs below the water level, so there is no running water sound, only the soft hum of the impeller drawing water into the unit. Also, all water says inside the tank, so there is no concern with leaks or broken hoses as you might expect from an external canister filter. I have this filter set up in a 40 gallon tank with one medium sized red-eared slider. It does a great job of keeping the water clear, and it is easy to maintain. With more turtles or a larger tank, I would recommend using more than one U4 filter to ensure enough filtration power. Overall, I am very happy with this filter and would definitely recommend it to fellow turtle owners. ## 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.tn/products/2858674-fluval-u4-underwater-filter-freshwater-and-saltwater-aquarium-filter-black](https://www.desertcart.tn/products/2858674-fluval-u4-underwater-filter-freshwater-and-saltwater-aquarium-filter-black) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-09-21*