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Fluval C Power Filter

by Fluval
4.3 out of 5 stars 529 customer reviews
| 40 answered questions
List Price: $91.99
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C4
  • Power filter featuring 5 stages of filtration for aquariums between 40 to 70 gallons
  • Filters 264 gallons per hour
  • Equipped with cleaning indicator for when the polyfoam needs to be rinsed
  • Clip on filter; Quick and easy maintenance
  • Helps provide a stress-free environment; Works to maintain refreshing crisp water
8 new from $47.86 4 used from $45.84
$53.98 & FREE Shipping. Details In Stock. Ships from and sold by Amazon.com. Gift-wrap available.

Frequently Bought Together

  • Fluval C4 Power Filter
  • +
  • Fluval C4 Poly Foam Pad - 3-Pack
  • +
  • Fluval C4 Bio-Screen - 3-Pack
Total price: $73.46
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  2. Fluval C4 Bio-Screen - 3-Pack
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Style: C4

Product Details

Style: C4
Product Warranty: For warranty information about this product, please click here [PDF]
  • Product Dimensions: 6 x 8.2 x 8.5 inches
  • Shipping Weight: 3.2 pounds (View shipping rates and policies)
  • ASIN: B003SJXTIU
  • Item model number: 14003
  • Average Customer Review: 4.3 out of 5 stars  See all reviews (529 customer reviews)
  • Amazon Best Sellers Rank: #6,873 in Pet Supplies (See Top 100 in Pet Supplies)
    • Product Warranty: For warranty information about this product, please click here [PDF]

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Customer Reviews

Top Customer Reviews

5.0 out of 5 starsExcellent Hang-On-Back (HOB) Filter
By CaliOutlaw1a on March 6, 2011
Style Name: C4 Verified Purchase
I purchased the Fluval C4 about 3 months ago. Thus far it has kept my water absolutely crystal clear.
Overall: I'm very impressed and very pleased with this HOB filter. I'd recommend it to anyone looking for a nice all-in-one filter with easy maintenance.

Here's a list of some nice features:

-Better use of the space available in the filter box compared to other HOBs - Many other HOBs have dead space where there isn't any type of filtration happening. This filter has been effectively designed to allow maximum filtration in the space provided.

-Very nice all-in-one filter - Mechanical, chemical, and biological filtration all efficiently incorporated into the filter box. The trickle chamber with ceramic media makes this one of the best biological HOBs out there.

-Still customizable - Many people don't use carbon in their filters. The carbon slot is large and can be replaced with just about anything (e.g. more mechanical filter pads or extra biological media).

-Quality design & Easy maintenance - All of the components fit snugly together, and it is very easy to remove and replace different compartments of the filter for cleaning.

-Cleaning indicator - The filter has a built in cleaning indicator that pops up when the filter pads have become clogged causing the water level in front of the filter pads to raise.

-Flow regulator - The flow regulator actually works! I've had many HOBs where the flow regulator is very crude and imprecise. The flow regulator on the C4 is VERY precise and easy to adjust.

-Extremely quiet

-Intake tube height is very easy to adjust - Simply push up or pull down to get the intake exactly where you want it. No more adding or removing intake tube segments.Read more ›
16 Comments 177 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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5.0 out of 5 starsGreat filter - love it
By kenny on May 22, 2012
Style Name: C4 Verified Purchase
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.Read more ›
7 Comments 72 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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5.0 out of 5 starsI LOVE this HOB.
By ECW on December 9, 2011
Style Name: C4 Verified Purchase
I really love this HOB filter. Some may argue but I think this is the upgraded Aquaclear. They use the same motors as the Aquaclears and have redesigned the internals as well as the external look of the filter. They really thought this HOB filter design thorougly. It is much sleeker and attractive than the older Aquaclears as you can obviously see, but works as well or better in my opinion.
Everything is designed with ease of maintenance and performance in mind. To clean it is incredibly easy. Each compartment of filtration is seperate and can be taken out easily as needed for maintenace. You don't even have to turn off the filter to maintain it. If you want to clean the mechanical sponge (the only thing I clean really) it's as simple as pulling up the back compartment which is seperate from the other compartments. Unlike the Aquaclear which you have to take out everything on top of the sponge first to get to the sponge which needs the most frequent rinsings. This makes for much easier regular maintenance than the Aquaclear.
The mechanical filtration on this filter is also upgraded from the Aquaclears. The sponge has a material similar to the Aquaclear's sponge but now also has a tweak/improvment made to catch the tiny particles that float around in your tank. It is a two part sponge fused together which is a coarse sponge with a material similar to polyfil batting attached into one. The mechanical filtration even has a indicator that pops up when the sponge needs rinsing.
If you choose to use carbon (I don't I filled that compartment with more biomedia) you just lift out the integrated wet dry and pull out the basket that holds the carbon and replace. Drop the basket that holds the carbon back in and put the wet/dry system back on top it's super easy.Read more ›
12 Comments 56 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Most Recent Customer Reviews

5.0 out of 5 starsCrystal clear water!

I have had this c4 filter for a few weeks now. I absolutely love it. Thought my water was pretty clear until using this for about an hour. It is crystal clear. Read more

Published 2 days ago by SandyR
5.0 out of 5 starsGreat filter

I have been using this in my 30 gallon aquarium as the sole filter now for almost a year. I have never used the predecessor model though, the AquaClear, but I am assuming that all... Read more

Published 3 days ago by Spencer Neal
5.0 out of 5 starsSuper super super quiet. I'll post an update in a month

Ok it is still early so I'll reserve the right to change this post in the future, however, I felt the need to post this after hooking this up (just received it), it is the quietest... Read more

Published 6 days ago by Kevin
5.0 out of 5 starshands down the best hob filter available

hands down the best hob filter available. i use it for my 36g african cichlid tank and it keeps the water parameters in check for weeks at a time!

Published 12 days ago by Justin
5.0 out of 5 starsSo she told me how great the 3 different filtering systems worked and...

My sister told me about this water filter for my 50 gallon aquarium. So she told me how great the 3 different filtering systems worked and how quite it was. Read more

Published 19 days ago by laurie holt
5.0 out of 5 starsworks great!

I bought this for $35-ish and it has been functioning for year perfectly. It's a 50 gallon tank and this has kept the water perfectly clear and with the same filters it came with. Read more

Published 23 days ago by Pete
5.0 out of 5 starsexcellent filter. The aquarium water has never been clear

excellent filter . The aquarium water has never been clear . Filter very quiet.

Published 24 days ago by robchar
5.0 out of 5 starsFilter this

Super filter, it is compact, it's bigger in the back than my Aqueon , but there is less of it in the tank, has multiple filtering methods. Read more

Published 25 days ago by kevin koffel
5.0 out of 5 starsGreat HOB Filter

I had been running an Aquaclear 50 on my 23g tank but got tired of cleaning the sponge every week iI had eyeing this filter for some time. Read more

Published 27 days ago by Jean
5.0 out of 5 starsGreat Filter

First Fluval filter I've bought and I must say I'm more then pleased with it. Just after 2 days the water is crystal clear and after a week the noise level remains practically none... Read more

Published 28 days ago by Amazon Customer

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