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Your cart is empty.Penn-Plax presents the Cascade 20 Mini Power Hang-On Filter. This filter quietly delivers crystal clear water, and pushes water at 20 Gallons per Hour (GPH) for tanks up to 7 Gallons in size. It’s great for Freshwater and Saltwater aquariums. Accommodating: The adjustable flow knob allows for increased or decreased water flow at will, which is extremely helpful during feeding times, or use it as needed. The hang-on design is constructed for safe mounting. With a provided extension piece, the lift tube measures between 5” (min) and 6 1/2” (max). Extremely Beneficial: This Cascade filter utilizes disposable, double-sided media cartridges that contain Poly Fiber Floss. The included cartridge traps floating particulate matter, removes harmful chemicals and toxins, clears up discolorations, and reduces foul odors from your aquarium’s water. Overall Measurements: 4. 5” (H) x 3. 75” (W) x 3” (D). Shop Penn-Plax for All Your Pet’s Needs: Penn-Plax is a manufacturer and distributor of top quality pet supplies, who specialize in creating excellent pet products for animals, both great and small.Pour enough water to completely immerse impeller cover before turning filter on. Never run filter dry.
Naj
Reviewed in the United States on May 12, 2025
Love this filter. No noise, silent as can be. Great for 3 gallon tank. I have 2 of these filters and am happy with both. Easy to install and start up.
kc10squared
Reviewed in the United States on April 24, 2025
The media could not be loaded.
Annie
Reviewed in the United States on April 21, 2025
I was surprised at how well this filter works for how small it is!!! Aquarium is clear and there isn’t any accumulation on the bottom of the tank.
Patrick H
Reviewed in the United States on March 22, 2024
The media could not be loaded.
Hughes
Reviewed in Canada on February 18, 2024
No real complaints. They give this for a decent price but you realize they make the real money on the filter refills as you need to really change every 90 days or so. Still works after a year.
Customer
Reviewed in India on December 11, 2024
Defective product. The filter did not start at all. Seems like the wiring or plug is faulty.
jessica delgado
Reviewed in the United States on June 22, 2023
People need to read. it's called the cascade 20 because it filters 20 gallons per hour, NOT because it's for a 20 gallon tank. it's for nano tanks up to 7 gallons and works great for that size.I added black sand to my tank and the water was very cloudy. I added this filter and the next day it was much clearer, the following day it was crystal clear.The cartridges are very small and probably would need replaced often but I plan on making makeshift replacement out of sponge filter media and maybe a little carbon.It looks nicer than some others and the water flow is gentle, which my betta appreciates. Sometimes the removable top rattles but if I move it a bit it stops and then it's super quiet.
gm
Reviewed in the United States on June 1, 2022
This review is for my initial use of the #20 Cascade filter. I promise I will update, if my expectations go south. I am using this filter in a 15-gallon rimless tank that already has a sponge filter in it. There is little water movement with the sponge filter alone. Now, the water flowing from the Cascade is slightly moving the leaves of a Crypt about 20 " away. This is wonderful.My tank is 3 1/2" from the wall. This gap limits what filter can be used. Also, my glass top allows for just 1 1/2" for the spillway. This Cascade works just fine with those measurements.As far as noise goes...yes, there's some when it first primes itself, but after it gets going the noise virtually stops. I did remove the top though, because it did rattle a bit. That may have been the noise some reviewers complained about (?). Very satisfied with the results.I added my own mix of media with floss as the last material the water passes through. The filter body is transparent giving you a good indication when the media needs changing. Like that.It's critical to always have water in the motor's side of the filter before plugging it in. Otherwise, the motor will burn-out pronto. This is the loudest time as the motor goes to work filling the filter box. This noise ceases once the box is full. Also, just enough water remains in the motor's compartment-side when the filter is turned off making a safe restart possible. This has been my experience since I have the filter on a timer.The plastic has a solid feel to it, and its blue color has a warm ambience. That's a bonus.So, this is only the beginning. What's up ahead?
Sagey
Reviewed in the United States on March 28, 2021
We bought this to replace a Topfin filter we had which suddenly stopped working. This filter is rated for a smaller tank which was good for our 5 gallon tank. However, it only has one filter instead of the 3-step filter that the Topfin had. And that showed very quickly. After only 4 or so days of cleaning the tank, the murkiness of the water started and a day or so later, some serious algae and other things started proliferating. It clearly lacked the filters that should come with any filtering system, no matter for how small a tank. Our betta also didn't enjoy the "waterfall" that the filter made the way he did the Topfin one. We ended up getting another Topfin G10 filter which has the 3 filter system. The water now is staying clear between cleanings, and out betta is again happily playing in the waterfall. :-)
Javier
Reviewed in Mexico on September 25, 2019
Es un producto recomendable, no hace ruido, solo si tienen que revisar los litros que mueve el filtro con litros de la pecera, por ejemplo mi filtro es tamaño 20 es decir mueve 20 galones, más no es para una pecera de 20 galones.
sreekumar
Reviewed in India on March 30, 2018
Very bad product. Couldn't even withstand half an hour run time. It just stopped working. request for return and no response yet. So in case the piece you get is bad, forget your money.
Tiffany B
Reviewed in Canada on March 14, 2018
Works great on my 3.4 gal. Very small, for some reason I was expecting it to be a little bigger but its cute and works great. The insert is no good. But I left it in for now. I shoved an aquaclear (20/30) bio media bag in it and it just fit. Of course that media goes in a much larger filter so even if I removed half of it. And used filter floss with it. It would work great. For now just the media is working for me and it's quiet with great flow. It says it will work up to 7 gal. An I'm sure it would. But I would only put it on5 gal max myself.
Amber
Reviewed in the United States on February 28, 2017
I am using this small filter for my 3 gallon dwarf puffer tank and it works pretty well. This fits right on the side of my mini tank with no problems at all. For my puffers this is a little high powered when it comes to the water coming out, but I do have it turned down most of the way. One problem with that, the water flow does not seem enough to get all the way through the tank, so some spots look like sitting water. Overall though this does have good suction power, I can sit and watch pieces going into the filter so I know it is working properly. For the most part this is quiet, but it does have some occassion it picks up noise for some reason. For the purpose I am using this, it works out pretty well for the limited choice of "Real" small filters.
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