The number of seconds were divided by 4, which gave us the gallons per second. The two times for each category were added to each other and then divided by 2 to get the average. We converted each time into seconds, this made things simpler. Then, we got to do math, so fun, let me tell you. We timed how long it took for each filter to fill up the tub.Įach filter was tested four times, twice without any filter media and twice with all of the included filter media installed. Then, we used a 4 gallon (15 liter) tub to capture the water cascading from the outflow. We attached each filter, one at a time and got it primed and running. To figure out the GPH (gallons per hour) that each filter is able to pump out, we first filled a large, sturdy plastic tote with water. GPH Testing Katherine testing Fluval C4 GPH We unboxed everything, set them up, tested their GPH, examined and rated their features and let them run on my various tanks. We bought the following filters, all of which are rated for 70-75 gallon tanks (265-284 liter): We purchased and tested five of the most popular hang-on-the-back filters on the market so that we could test them out for a head-to-head challenge. Fluval also makes C2 and C3 filters that are designed for smaller tanks. Last update on / Commissions Earned / Images from Amazon Product Advertising API My only real gripe is that this filter has an external motor that needs to be primed before it can start suctioning water.īottom line: the Fluval C4 is really awesome and I highly recommend it. This filter has a unique design that places each stage of filtration in its own little compartment, all of which can be quickly and easily pulled out for maintenance. It might look like any other filter from the outside, but a quick peek under the hood will show you that its design is anything but ordinary. The Fluval C4 is hands down one of the best hang-on-the-back filters in the aquarium trade. Known for making quality filters, and constantly innovating trying to bring us the best in the business, how exactly does the Fluval C4 power filter stand up to their legacy?įor this review, I bought the C4 and put it through its paces and compared it to similar competing HOB filters to help you know if this is the right filter for you. Fluval have been a mainstay in the aquarium industry ever since they introduced the first 3-stage filter with synchronous motor technology back in 1975.

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