Penn-Plax Cascade 300 Power Filter – Hang-On Filter with Quad Filtration – Great for Freshwater and Saltwater Setups
Condition: New
$65.00
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FREE refund/replacement until Jan 31, 2027 Learn more
FREE refund/replacement until Jan 31, 2027 Learn more
This item's return window has been extended for the holiday season: FREE refund/replacement until Jan 31, 2027
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
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Availability:
In Stock.
Arrives
Nov 17 – Nov 21
At a glance
- Condition
- New
- Size
- Cascade 300
- Model
- CPF5
- Dimensions
- 6.25 x 11.25 x 8.25 in; 0.01 oz
- Weight
- 0.01 oz
- Color
- Clear blue
- Material
- Plastic
- In the box
- Penn-Plax Cascade 300 Power Filter – Hang-On Filter with Quad Filtration – Great for Freshwater and Saltwater Setups
- Warranty
- Warranty
Features 5
- QUIET & EFFICIENT: The Cascade 300 Power Hang-On Filter quietly delivers crystal clear water throughout the aquarium. This filter pushes water at 300 Gallons per Hour (GPH) for tanks up to 100 Gallons in size. Its 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. The lift tube extends between 8. 25 (min) and 12. 25 (max). Please be aware that the filter indeed does make some noise.
- EXTREMELY BENEFICIAL: This Cascade filter utilizes disposable, double-sided media cartridges that contain Activated Carbon and Poly Fiber Floss. The included cartridge traps floating particulate matter, removes harmful chemicals and toxins, clears up discolorations, and reduces foul odors from your aquariums water. Media cartridges are recommended to be replaced once a month.
- REVOLUTIONARY: The Cascade 300 Power Hang-On Filter features a Bio-Sponge cartridge that optimizes colonization of anaerobic bacteria, and is independent from the first stage filter media. In addition, our Bio-Falls system enhances water oxygenation, and aids with removing ammonia and nitrate.
- OVERALL MEASUREMENTS: 8. 25 (H) x 11. 25 (W) x 6. 25 (D)
Description
Penn-Plax presents the The Cascade 300 Power Hang-On Filter quietly delivers crystal clear water throughout the aquarium. This filter pushes water at 300 Gallons per Hour (GPH) for tanks up to 100 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. The lift tube extends between 8. 25” (min) and 12. 25” (max). Please be aware that the filter indeed does make some noise. EXTREMELY BENEFICIAL: This Cascade filter utilizes disposable, double-sided media cartridges that contain Activated Carbon and 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. Media cartridges are recommended to be replaced once a month. REVOLUTIONARY: The Cascade 300 Power Hang-On Filter features a Bio- Sponge cartridge that optimizes colonization of anaerobic bacteria, and is independent from the first stage filter media. In addition, our Bio-Falls system enhances water oxygenation, and aids with removing ammonia and nitrate.OVERALL MEASUREMENTS: 8. 25” (H) x 11. 25” (W) x 6. 25” (D).
Specs 17
| Product Dimensions | 6.25 x 11.25 x 8.25 inches; 0.01 ounces |
|---|---|
| Item model number | CPF5 |
| Department | Unisex-Adult |
| Manufacturer | Penn Plax |
| Item Weight | 0.01 ounces |
| Item Package Dimensions L x W x H | 11.4 x 8.7 x 6.54 inches |
| Item Dimensions LxWxH | 6.25 x 11.25 x 8.25 inches |
| Brand Name | Penn-Plax |
| Target Audience Keyword | fish |
| Directions | Follow included paper instructions. |
| Model Name | Penn-Plax Cascade 300 Power Filter – Hang-On Filter with Quad Filtration – Great for Freshwater and Saltwater Setups |
| Color | Clear blue |
| Size | Cascade 300 |
| Material | Plastic |
| Age Range Description | All Life Stages |
| Number of Items | 1 |
| Specific Uses for Product | Indoor |
No specs match.
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Nov 17 – Nov 21
Yes, absolutely! This item's return window has been extended for the holiday season: FREE refund/replacement until Jan 31, 2027.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Fantastic value for the cost. It’s crazy powerful yet it’s as quiet as a whisper
Size: Cascade 300
I decided to switch to this filter for my 62-gallon fancy goldfish tank after running a Marineland Penguin for quite some time... it was the best decision I could’ve made. The biggest pro to using this filter is the silence. It’s the quietest hang-on-back filter that I’ve ever come across. 4 months in and there’s little to no mechanical noise coming from the motor, my mother often puts her ear up to the filter because she can’t believe it’s even on. There’s also very little noise created by the water return (which I absolutely love). If you’re someone who likes to hear the sound of running water this filter will not be it for you, you can hardly hear a trickle. The filter is also incredibly efficient with a fantastic (and completely adjustable) flow rate. They really don’t lie on the box when they say this thing turns over 300 gallons of water per hour. Be prepared to have your water looking clear as day, especially when used with the right filter media. My only concern with this filter is that the materials do feel a little bit fragile, so I’m curious to see how it holds up long term. All in all though, it’s fantastic value for the cost; it’s just as good as any other mainstream brand filter out there.
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Reviewed in the United States on May 21, 2022 by Alexander
Perfect for customization to allow a fit on the side of a 55 gallon, or smaller!
Size: Cascade 300
I love this unit! I was able to do a minimal customization to allow this unit to hang on the side of my 55 gallon tank! It’s small yet large enough to keep the tank clean. Perfect for filter modifications! It’s 3-4 times larger than the quiet flow 10! It’s much, MUCH quieter than the whisper EX! Enough room to add any media you’d desire to the holding/processing tank. Has a flow adjustment which would be great for more delicate fish. With a hand grinder I was able to remove 2 tabs, one from each side of the unit where the opening for the water to flow is, it wasn’t quite small enough to fit the 55 gallon side, so I took a hand grinder and cut off each tab shown in my photos, it fits perfectly into the space now and works great for the area I needed it to fit into! Happiness! PLEASE NOTE: If you appreciated this review please give it a “thumbs up/like if it was helpful” I truly appreciate you helping me to continue to give honest/unbiased insight into products I’ve used and you may have questions about. Interested in a product but don't know enough about it and would like it reviewed? Please let me know and I'll see what I can do... follow me for a vast array of purchased product reviews. Thank you 🙏
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Reviewed in the United States on October 26, 2019 by Symbols Of Love
Incredible Value
Size: Cascade 300
I’ve been an aquarist for 50 years, so I’ve used most major brands. I needed a low-budget filter for a proof of concept - experimental stuff. This is an awesome filter. Having said that, there’s no way I’d have this in a 100 gallon saltwater tank, and very skeptical that it would suffice. This filter is quiet and well-made. It took a minute or less to assemble, and everything fit well, had a quality feel, and fit perfectly together. I used this on a 20-gallon long saltwater tank I’m using for propagating bubble-tipped anemones and the flow is just ideal. I would estimate that this filter would be very good to excellent for nano-reef aquariums up to 30 gallons (With a powerhead), and 40 gallons for fish-only saltwater tanks. I’d maybe up that to 60-75 gallons for freshwater. Other sizes, I’d still suggest this pump ...just get 2. Personally, I’d have two of these on a 40-gallon reefer, but I’m also running a low-flow powerhead too. I don’t see any negatives in buying this filter. The price is outstanding for what you get and so what if you gotta buy two...or three...it’s still going to provide quiet, excellent filtration power for your hard-earned money. UPDATE Running a few months now, doing great!
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Reviewed in the United States on March 30, 2020 by Joe A.
Missing critical parts
Size: Cascade 300
Arrived without motor and a note from another customer that noted that the motor didn’t work. Huge waste of money.
Reviewed in the United States on August 16, 2026 by Amazon Customer
Really nice, pass if you enjoy silence.
Size: Cascade 300
It looks really nice! No complaints with the job it does. I just bought it a week ago. Now I just got a fully submersible one to replace this. It's pretty loud. We havd ours in our living room. Annoying when your trying to relax or watch tv. If you don't care about the noise I'd say go for it. But yeah, im sticking with the submersible one. I enjoy not listening to water being cleaned. Maybe that's just me.
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Reviewed in the United States on June 12, 2026 by Tiaya
Seemed kinda cheap in the beginning. But more then makes up for it
Size: Cascade 300
So far this thing is great... Super quiet and the flow is fully ajustable. If you have a fish /critter that requires minimal currents but still need powerful filtration this is a great filter. The flow its self is fully ajustable on the unit and the "Bio falls" splits water evenly on exit across the waters surface. I bought it for a turtle tank but didn't wanna spend the money on another canister filter. I had every intention of buying another canister filter later but I've decided to move this filter to my Axolotl tank and move the canister filter to the turtle tank. And even with messy turtles this filter has been able to keep up with their bio load. The media that comes with the unit isn't the best but it's units large capacity leaves plenty of room for whatever you'd like to add. Plus the cartridges it comes with make it easy to remove the old and cut any sponge you'd like to fit if that's what you chose to do and all for a price much cheaper then many other competing HOB's.
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Reviewed in the United States on June 6, 2019 by T Machin
1 year old and still good as new
Size: Cascade 300
I have had this for about 1 year now and it is still going strong. Keeps the tank clean and does its job just as good as the day I got it. I turn it off, pop the lid off and rinse the filter media in old tank water once every 3-4 weeks. Then put the media back, lid back and turn it on. Super easy to access and clean. Easy to put back together. Well worth the price.
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Reviewed in the United States on January 17, 2026 by Elisha Mendoza
PennPlax 300
Size: Cascade 300
3 months and the clup on thw motor broke and water went everywhere. Was good while it lasted for 3 months. Rate a 3 worked well
Reviewed in the United States on May 30, 2026 by Maggie Adams