5-stage filtration system that does an amazing job keeping your water clean and clear.
Its a HOB filter that works much like a canister filter.
Great media capacity & easy to custom fit custom media due to the large and easy-to-access compartments.
The modular compartments make dismantling this filter for scrubbing and changing out media incredibly simple.
What You Need To Know About The Fluval C4
The Fluval C4 Power Filter is a hang-on-back filter that works much like a canister filter.
It has a modular media compartment design that allows you to switch out or clean only one part of it at a time, and it can hold much more media than other HOB filters on the market. The modular design also makes it simple to custom-fit your own media.
The C4 features a 5-stage filtration system (two mechanical, one chemical, and two biological) that does a great job at sifting out particles and filtering out impurities.
Coupled with the high flow rate, this filter is capable of producing amazingly clear water that will keep your fish happy and healthy.
This filter also features precise flow rate control with its patented Refiltration system, which allows you to adjust the flow rate without affecting the filter’s efficiency.
If you decrease the flow, up to 50% of the water in the filter is cycled back through the system, further filtering it and enhancing water clarity.
Excellent water flow to ensure you get the best filtration possible.
Modular media compartments make cleaning and switching out media a piece of cake.
Five-stage filtration does a great job at scrubbing the water clean.
The included bio-media is very easy to clean.
Easy to custom fit custom media due to the large and easy-to-access compartments.
Dual-sided foam pad needs replacing every few months, but this is mainly because it does such a great job at trapping particles.
Spout that trickles water over the the bio-media can be prone to clogging.
There are lots of crags and crevices around the impeller that make cleaning it a little tough.
More Popular HOB Filter Brands
Hands On Fluval C4 HOB Filter
The C4 was clearly designed with quality and efficiency in mind.
There is very little dead space inside the filter, so water has to pass through the filtration media. Everything fits together snugly and the plastic components are high-quality and seem durable.
The star of the show is the five-stage filtration system that Fluval included, which passes your tank water through a cycle of mechanical, chemical and biological filtration:
Stages 1 & 2: Mechanical filtration via a double-sided poly/foam pad. The porous foam side traps larger particles, while the dense poly foam side filters fine debris.
Stage 3: Chemical filtration with activated charcoal removes odors, impurities, and discolorations.
If you prefer not to use activated charcoal in your system, the media basket is big enough for you to substitute another foam pad or other media of your choice.
Stage 4: Biological filtration via a bio-screen at the top of the trickle chamber. This filters out any debris before the water drips into the biological chamber, and ensures that the water flow is evenly spaced.
Stage 5: Biological filtration with C-nodes. The unique “star shape” and porous surface of the C-nodes provide an optimal environment for friendly bacteria to live, and enhances ammonia and nitrate removal.
But how does the five-stage filtration actually work?
Amazingly well. This filter keeps tank water crystal-clear, and the high flow rate ensures that all your water is cycled through multiple times per hour.
There is also a built-in cleaning regulator that alerts you when your filter pads become clogged and it’s time for a cleaning.
Speaking of cleaning, the modular compartments make dismantling this filter for scrubbing and changing out media incredibly simple, though there are some nooks and crannies around the impeller that need extra attention.
Here are a few maintenance tips for Fluval C series filter.
Fluval once again hit a homerun with this power filter.
The Fluval C4 combines the greater media capacity and higher flow rate of a canister filter with the lower price and easier cleaning of anHOB aquarium filter to give you the best of both worlds. The five-stage filtration works well, and the filter is both easy to use and easy to clean.
The C-series is a step up from the excellent AquaClear line of filters by Hagen, which Fluval also owns.
While both are great filters, if you have a couple extra dollars to spend, the C4 is a better choice than the AquaClear for most people.
Jack Dempsey has over 20 years of experience with freshwater aquariums, his goal is to help beginners avoid the biggest mistakes when getting started. If you find something helpful please share it on your favourite social network. If you need help with anything send Jack a question.
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