--- product_id: 2271667 title: "Fluval C4 Power Filter, Fish Tank Filter for Aquariums up to 70 Gal." brand: "fluval" price: "Β£68.25" currency: GBP in_stock: true reviews_count: 13 category: "Fluval" url: https://www.desertcart.co.uk/products/2271667-fluval-c4-power-filter-fish-tank-filter-for-aquariums-up store_origin: GB region: United Kingdom --- # Enhanced nitrification 5-stage filtration Quick cleaning Fluval C4 Power Filter, Fish Tank Filter for Aquariums up to 70 Gal. **Brand:** fluval **Price:** Β£68.25 **Availability:** βœ… In Stock ## Summary > πŸ’¦ Dive into Clarity with Fluval C4! ## Quick Answers - **What is this?** Fluval C4 Power Filter, Fish Tank Filter for Aquariums up to 70 Gal. by fluval - **How much does it cost?** Β£68.25 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/2271667-fluval-c4-power-filter-fish-tank-filter-for-aquariums-up) ## 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€’ **Biological Boost:** The Bio-Screen pad maximizes surface area for beneficial bacteria, promoting a healthy ecosystem. - β€’ **Crystal Clear Waters:** Experience pristine clarity with a 5-stage filtration system that tackles all types of debris. - β€’ **Effortless Maintenance:** Designed for busy lifestyles, the easy-slide foams make cleaning a breeze. - β€’ **Toxin-Free Environment:** Activated carbon effectively eliminates harmful toxins, ensuring a safe habitat for your aquatic friends. - β€’ **Supercharged Nitrification:** The Biological Trickle Chamber accelerates nitrification, keeping your tank thriving with Fluval C-Nodes. ## Overview The Fluval C4 Power Filter is a high-performance, 5-stage clip-on filter designed for aquariums ranging from 40 to 70 gallons. It features mechanical, chemical, and biological filtration stages, ensuring a clean and healthy environment for both freshwater and saltwater fish. ## Description The Fluval C4 Power Filter features 5 stages of filtration: 2 mechanical, 1 chemical and 2 biological stages for top performance. The C4 Power Filter is equipped with the Fluval C4 Poly/Foam, Activated Carbon, C-nodes and Bio-Screen pad. An integrated trickle chamber filled with C-Nodes is where biological filtration is super charged for fast and efficient nitrification. The mechanical filtration is performed by a dual layer of foam and polyester, and is easily removed for quick cleaning. The patented recirculation grid enhances mechanical filtration when the flow rate is reduced. A convenient chemical insert basket directs water flow to maximize toxin removal. Maintaining only one stage at a time will preserve beneficial bacteria, resulting in a stress-free environment, while ensuring aquarium water stays clear. The Fluval C4 Power Filter clips on, and is ideal for use on aquariums up to thirty gallons. It is the perfect way to provide your fish with refreshing and clear water. 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: Great filter - love it - I have the c4. It's great and I have been in the hobby for over 30 years. I am using it on a 20 gallon tank. You can never have too much flow rate. To slow the turbulence I use a Fluval Edge prefilter, the flow adjuster and an aquaclear 50 foam sponge at the water output. Let me comment on a few negatives people have written about this filter. 1) The water in my tank is crystal clear and as Jack Nicholson and Tom Cruise said in "A Few Good Men" ...."It's that simple." "Are we clear?" "Yes, sir." "ARE WE CLEAR!?" "Crystal" ..... LOL,love that movie. To those who said the water is cloudy, yes, it was at first. I think it was because of the C nodes. You need to either rinse it clear for hours before using it or just let the filter do it in the tank. It took about 2-3 days to clear up but once it did, the water in my tank is crystal clear. I have been running it for 2 weeks and without the charcoal. I replace it with the aquaclear Biomax to increase the biological media. The Biomax and C nodes' fine powder dust clouded the water but like I said, it's clear crystal clear now. Just let the filter do it's job and the water will be crystal clear in a couple of days. 2) My filter is so quiet that you don't know it's on. What I did was apply some vaseline onto the impeller shaft and into the hole of the impeller. I did this without hearing if it needed to or not. I just applied it before I used it. The motor has NO noise at all and the lid does not rattle. The only thing you hear is the water cascading out of the filter. 3) The self priming issue is that you need to fill the filter box with water before you start it. Once it is filled with water, it will self primes when you plug it in. It will take about a minute to self prime as it sucks up the water through the siphon tube. To help the self prime and make it more efficient, I clogged the hole on top of the U intake tube. Now when you unplug the filter and replug it it starts right up without it needing to refill (self prime) the intake tube. If you do a water change and the water in the tank falls just above the bottom of the U intake tube inside the filter box you will need to refill the filter box otherwise it won't self prime. So add water into the box when you refill your tank and when you replug your filter, it will self prime. 4) Try to buy the larger filter (C4) if you can. You can always change the impeller to the smaller impeller if you feel the flow it too much or modify it like I did with prefilter sponge and aquaclear 50 foam. With the bigger filter, it'll clean more and hold more beneficial bateria. And if and when you upgrade your tank, you won't need to buy a new filter. The impellers for the fluval C series and aquaclear are the same. Matter of fact, the motors are the same for all fluval C series and aquaclear except for the 110 model. It's the impeller that determines the flow rate and they are interchangeable between models and sizes except the 110. All the positives you've read about this filter is true. It's easy to clean, the red tab that notifies you that your filter foam needs cleaning is great; you are not stuck with any proprietary media which usually cost a lot more to replace; the foam pad and bio media DO NOT need to be replaced - just rinse the foam pad or bio media in used or dechlorinated water. They should last for several years. If you use activated carbon/charcoal which I don't, you'll need to replace them every so often depending on your tank load. You can buy any brand of activated carbon and put it into a nylon bag and it's save you money. Try to use a prefilter. It's attached to the bottom of the intake tube. It helps to catch the debris and uneaten food before it goes to the foam pad keeping it cleaner. It'll also increase your beneficial bacteria load and your fish will love to peck on it for the uneaten food. The only thing is that you'll need to rinse it once in a while or it will clog up completely and slow the filter down to a trickle. Just rinse it when you do your water change. Hope this helps.....may your fishes be happy and healthy Update: Feb 22, 2013. The filter is still going strong. The reading of the water has been 0 ammonia, 0 nitrite, and 5 nitrate with weekly water changes. It would probably be the same with a water change every other week. And this is in a very overstocked aquarium. The only thing I need to do is rinsed the prefilter with every water change or it will clog up and restrict the water flow to a trickle and the water to the trickle part of the filter will not get any water. That's how good the prefilter is in catching the debris and keeping the foam and biomax clean. The red tab pop up device has never moved and when I check the foam it is very clean but I do rinsed the foam every 3 months and LIGHTLY rinse/shake the biomax every 6 months in used aquarium water. DO NOT buy NEW foam or biomax. Just rinse them. They will last several years if not forever especially if you use a prefilter and the prefilter does not need to be changed just rinsed also. I had to clean the impeller just recently since it wouldn't start back up/spin. It had a lot of slime. I just rinsed off the slime from the impeller and shaft and reapplied some vaseline and it was of and running like new. The water is crystal clear also. Update: Jan 13, 2015. The filter is still going strong. Still quiet as when I first bought it. I have upgraded my tank to 25 gallons and it's still working like a charm. I have not bought any replacements, just rinsed the prefilters, pads, biomax, c nodes and impeller. My readings are still 0 ammonia, 0 nitrite, and 5 nitrate and I'm changing my water once a month and sometimes once every two months (getting lazy). This is a great filter. Updated.... Feb 22, 2016. The filter is till going strong. Quiet as when it was new. I did replace the form as it was wearing down from squeezing it when I clean it. All the bio medias are still in good and hasn't broken down. M water reading are the same. Changing water less frequent. Getting lazy because of the good water quality from the filter but not good for the fish which needs the minerals from new water and removal of nitrates. Update.....2/6/2019. The filter is still going strong. Have not replaced any parts except for the foam that i mentioned before. The motor is still quiet and pumping like new. The biomedia are still intach and have not broken down. I have not been as diligent in chaging the water as before. Been changing the water about every three months and the numbers still reading 0,0,5. Upgrading the biomedia and using the C4 will do wonders for your aquarium and ease maintenance care. Review: Decent product - I purchased this filter a month ago. It is installed on a Marineland 60 gal. cube. The aquarium is a Corner- Flo and already has a Fluval 360 installed. The water in the tank was not as crystal as I would like and I think the Corner_Flo option may be impeding the canister a bit. The tank has African Peacocks and Haps in it. They do make a mess. Not wanting to put another canister in the already crowded cabinet. I opted for an HOB filter. I wanted one that was simple to clean and maintain. I looked at the AC's, Fluval C series and the Eheim Liberty series. This one fit the bill for me. All three filters can use "Bulk Media". A requirement for me. (hate cart's and premade foams $$$$$$) Of the original media I only used the the white foam and polyester pad filter and the small pad on the wet dry filter. It took about a week before the main filter pad was starting to clog (red indicator floating) I rinsed it and it lasted about another week. The poly pad on the back is the culprit and they do make the foam with out it. But for me I just decided to toss it and I cut some blue bonded filter material and installed it.. I also put polyester floss in where the carbon would go as I do not use carbon. In the wet dry bio holder. I put Seachem Matrix instead of the ceramic nodes.. Also many reviews on the web state that they do not use the little white pad on top of the wet dry filter. Bad move as the water that comes from the spout has not actually been through the main filter. It is tank water straight from the pump and the debris will clog your bio media. I plan to put some thin foam or polyester there when the original is bad. Overall this filter has been good. The water is much clearer now. The output is designed so that you do not get the "water noise" that some HOB's have. (Unless you let your water level drop a ways.) The filter has some noise on start up. It has started to diminish as it runs (slime build up in the pump). I did some research on this and it is common. If the amount of noise (what little there is, way less than an air pump) is unacceptable, the application of vaseline or silicone grease to the impeller shaft usually fixes the problem. This filter also has a wide resting area for the tank brim. A good deal for a tank with a frame but not so good with a frameless tank. The problem is in the leveler. The design of the leveler is the same as the AC's. Both are made by Hagen. The leveler is a snug fit in its hole. However with a frameless tank the tallest leg must be used in order to level the filter. The problem is that if the leg is not completely square with the tank surface. Any pressure applied to the filter during maintenance causes the leveler to "cam or twist". As the filter is heavy when full of water it moves pretty abruptly when this happens. One could use a block of some sort between the tank and leveler so that a shorter leg could be used which would stop the twisting issue. All in all I like this filter. Have already purchased another and would recommend it . ## Features - 5-stage clip-on power filter designed for freshwater and saltwater aquariums between 40 and 70 gallons - Two mechanical stages trap large and fine debris, foams easily slide out for quick cleaning - Chemical stage with activated carbon effectively removes toxins - Biological stage features Bio-Screen pad, blocks debris and provides massive surface area for beneficial biological activity - Biological Trickle Chamber super charged for fast and efficient nitrification when loaded with Fluval C-Nodes ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B003SJXTIU | | Allergen Information | Nut Free | | Best Sellers Rank | #15,561 in Pet Supplies ( See Top 100 in Pet Supplies ) #119 in Aquarium Filter Accessories | | Brand | Fluval | | Brand Name | Fluval | | Customer Reviews | 4.1 out of 5 stars 5,109 Reviews | | Global Trade Identification Number | 00015561140034 | | Included Components | Clip-On Power Filter | | Item Form | Power | | Item Type Name | Clip-On Power Filter | | Item Weight | 1.24 Kilograms | | Liquid Volume | 265 Liters | | Manufacturer | Rolf C. Hagen (USA) Corp. | | Manufacturer Part Number | 14003A1 | | Model Number | 14003A1 | | Pet Type | Fish | | Target Species | Fish | | UPC | 015561140034 | | Unit Count | 1 Count | ## Images ![Fluval C4 Power Filter, Fish Tank Filter for Aquariums up to 70 Gal. - Image 1](https://m.media-amazon.com/images/I/81P7EYKTSRL.jpg) ![Fluval C4 Power Filter, Fish Tank Filter for Aquariums up to 70 Gal. - Image 2](https://m.media-amazon.com/images/I/81H7gDibHFL.jpg) ![Fluval C4 Power Filter, Fish Tank Filter for Aquariums up to 70 Gal. - Image 3](https://m.media-amazon.com/images/I/91+gj6q2XgL.jpg) ![Fluval C4 Power Filter, Fish Tank Filter for Aquariums up to 70 Gal. - Image 4](https://m.media-amazon.com/images/I/81JsQBqXR7L.jpg) ![Fluval C4 Power Filter, Fish Tank Filter for Aquariums up to 70 Gal. - Image 5](https://m.media-amazon.com/images/I/819oi66xixL.jpg) ## Available Options This product comes in different **Size, Style** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great filter - love it *by K***Y on May 22, 2012* I have the c4. It's great and I have been in the hobby for over 30 years. I am using it on a 20 gallon tank. You can never have too much flow rate. To slow the turbulence I use a Fluval Edge prefilter, the flow adjuster and an aquaclear 50 foam sponge at the water output. Let me comment on a few negatives people have written about this filter. 1) The water in my tank is crystal clear and as Jack Nicholson and Tom Cruise said in "A Few Good Men" ...."It's that simple." "Are we clear?" "Yes, sir." "ARE WE CLEAR!?" "Crystal" ..... LOL,love that movie. To those who said the water is cloudy, yes, it was at first. I think it was because of the C nodes. You need to either rinse it clear for hours before using it or just let the filter do it in the tank. It took about 2-3 days to clear up but once it did, the water in my tank is crystal clear. I have been running it for 2 weeks and without the charcoal. I replace it with the aquaclear Biomax to increase the biological media. The Biomax and C nodes' fine powder dust clouded the water but like I said, it's clear crystal clear now. Just let the filter do it's job and the water will be crystal clear in a couple of days. 2) My filter is so quiet that you don't know it's on. What I did was apply some vaseline onto the impeller shaft and into the hole of the impeller. I did this without hearing if it needed to or not. I just applied it before I used it. The motor has NO noise at all and the lid does not rattle. The only thing you hear is the water cascading out of the filter. 3) The self priming issue is that you need to fill the filter box with water before you start it. Once it is filled with water, it will self primes when you plug it in. It will take about a minute to self prime as it sucks up the water through the siphon tube. To help the self prime and make it more efficient, I clogged the hole on top of the U intake tube. Now when you unplug the filter and replug it it starts right up without it needing to refill (self prime) the intake tube. If you do a water change and the water in the tank falls just above the bottom of the U intake tube inside the filter box you will need to refill the filter box otherwise it won't self prime. So add water into the box when you refill your tank and when you replug your filter, it will self prime. 4) Try to buy the larger filter (C4) if you can. You can always change the impeller to the smaller impeller if you feel the flow it too much or modify it like I did with prefilter sponge and aquaclear 50 foam. With the bigger filter, it'll clean more and hold more beneficial bateria. And if and when you upgrade your tank, you won't need to buy a new filter. The impellers for the fluval C series and aquaclear are the same. Matter of fact, the motors are the same for all fluval C series and aquaclear except for the 110 model. It's the impeller that determines the flow rate and they are interchangeable between models and sizes except the 110. All the positives you've read about this filter is true. It's easy to clean, the red tab that notifies you that your filter foam needs cleaning is great; you are not stuck with any proprietary media which usually cost a lot more to replace; the foam pad and bio media DO NOT need to be replaced - just rinse the foam pad or bio media in used or dechlorinated water. They should last for several years. If you use activated carbon/charcoal which I don't, you'll need to replace them every so often depending on your tank load. You can buy any brand of activated carbon and put it into a nylon bag and it's save you money. Try to use a prefilter. It's attached to the bottom of the intake tube. It helps to catch the debris and uneaten food before it goes to the foam pad keeping it cleaner. It'll also increase your beneficial bacteria load and your fish will love to peck on it for the uneaten food. The only thing is that you'll need to rinse it once in a while or it will clog up completely and slow the filter down to a trickle. Just rinse it when you do your water change. Hope this helps.....may your fishes be happy and healthy Update: Feb 22, 2013. The filter is still going strong. The reading of the water has been 0 ammonia, 0 nitrite, and 5 nitrate with weekly water changes. It would probably be the same with a water change every other week. And this is in a very overstocked aquarium. The only thing I need to do is rinsed the prefilter with every water change or it will clog up and restrict the water flow to a trickle and the water to the trickle part of the filter will not get any water. That's how good the prefilter is in catching the debris and keeping the foam and biomax clean. The red tab pop up device has never moved and when I check the foam it is very clean but I do rinsed the foam every 3 months and LIGHTLY rinse/shake the biomax every 6 months in used aquarium water. DO NOT buy NEW foam or biomax. Just rinse them. They will last several years if not forever especially if you use a prefilter and the prefilter does not need to be changed just rinsed also. I had to clean the impeller just recently since it wouldn't start back up/spin. It had a lot of slime. I just rinsed off the slime from the impeller and shaft and reapplied some vaseline and it was of and running like new. The water is crystal clear also. Update: Jan 13, 2015. The filter is still going strong. Still quiet as when I first bought it. I have upgraded my tank to 25 gallons and it's still working like a charm. I have not bought any replacements, just rinsed the prefilters, pads, biomax, c nodes and impeller. My readings are still 0 ammonia, 0 nitrite, and 5 nitrate and I'm changing my water once a month and sometimes once every two months (getting lazy). This is a great filter. Updated.... Feb 22, 2016. The filter is till going strong. Quiet as when it was new. I did replace the form as it was wearing down from squeezing it when I clean it. All the bio medias are still in good and hasn't broken down. M water reading are the same. Changing water less frequent. Getting lazy because of the good water quality from the filter but not good for the fish which needs the minerals from new water and removal of nitrates. Update.....2/6/2019. The filter is still going strong. Have not replaced any parts except for the foam that i mentioned before. The motor is still quiet and pumping like new. The biomedia are still intach and have not broken down. I have not been as diligent in chaging the water as before. Been changing the water about every three months and the numbers still reading 0,0,5. Upgrading the biomedia and using the C4 will do wonders for your aquarium and ease maintenance care. ### ⭐⭐⭐⭐⭐ Decent product *by T***N on August 7, 2014* I purchased this filter a month ago. It is installed on a Marineland 60 gal. cube. The aquarium is a Corner- Flo and already has a Fluval 360 installed. The water in the tank was not as crystal as I would like and I think the Corner_Flo option may be impeding the canister a bit. The tank has African Peacocks and Haps in it. They do make a mess. Not wanting to put another canister in the already crowded cabinet. I opted for an HOB filter. I wanted one that was simple to clean and maintain. I looked at the AC's, Fluval C series and the Eheim Liberty series. This one fit the bill for me. All three filters can use "Bulk Media". A requirement for me. (hate cart's and premade foams $$$$$$) Of the original media I only used the the white foam and polyester pad filter and the small pad on the wet dry filter. It took about a week before the main filter pad was starting to clog (red indicator floating) I rinsed it and it lasted about another week. The poly pad on the back is the culprit and they do make the foam with out it. But for me I just decided to toss it and I cut some blue bonded filter material and installed it.. I also put polyester floss in where the carbon would go as I do not use carbon. In the wet dry bio holder. I put Seachem Matrix instead of the ceramic nodes.. Also many reviews on the web state that they do not use the little white pad on top of the wet dry filter. Bad move as the water that comes from the spout has not actually been through the main filter. It is tank water straight from the pump and the debris will clog your bio media. I plan to put some thin foam or polyester there when the original is bad. Overall this filter has been good. The water is much clearer now. The output is designed so that you do not get the "water noise" that some HOB's have. (Unless you let your water level drop a ways.) The filter has some noise on start up. It has started to diminish as it runs (slime build up in the pump). I did some research on this and it is common. If the amount of noise (what little there is, way less than an air pump) is unacceptable, the application of vaseline or silicone grease to the impeller shaft usually fixes the problem. This filter also has a wide resting area for the tank brim. A good deal for a tank with a frame but not so good with a frameless tank. The problem is in the leveler. The design of the leveler is the same as the AC's. Both are made by Hagen. The leveler is a snug fit in its hole. However with a frameless tank the tallest leg must be used in order to level the filter. The problem is that if the leg is not completely square with the tank surface. Any pressure applied to the filter during maintenance causes the leveler to "cam or twist". As the filter is heavy when full of water it moves pretty abruptly when this happens. One could use a block of some sort between the tank and leveler so that a shorter leg could be used which would stop the twisting issue. All in all I like this filter. Have already purchased another and would recommend it . ### ⭐⭐⭐⭐⭐ Amazing Filter, Gives You Crystal Clear Water *by J***O on May 8, 2026* This hang back canister filter is amazing! I bought it for my 75gal tank so I set it up on my 30gal tank while I was preparing the 75gal. This filter did an amazing job, better than the current hang back filter I had on it. Within a hour my 30gal tank was crystal clear best clarity I’ve seen since I started that tank. I loved it so much that I left it in my 30gal and bought a second one for my 75gal tank. Definitely recommend this filter. ## Frequently Bought Together - Fluval C4 Power Filter, Fish Tank Filter for Aquariums up to 70 Gal. - Fluval C4 Poly Foam Pad - 3-Pack - Fluval C4 Bio-Screen - 3-Pack --- ## 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.co.uk/products/2271667-fluval-c4-power-filter-fish-tank-filter-for-aquariums-up](https://www.desertcart.co.uk/products/2271667-fluval-c4-power-filter-fish-tank-filter-for-aquariums-up) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-06-08*