

Penn-Plax Cascade 400 Fully Submersible Internal Filter for Aquariums and Fish Tanks
Key item features
- QUIET & EFFICIENT: The Cascade 400 Submersible Filter quietly delivers crystal clear water throughout the aquarium. This filter cycles water at 110 Gallons per Hour (GPH) for tanks up to 20 Gallons in size. It’s great for Freshwater and Saltwater aquariums, along with a variety of Terrarium setups.
- ACCOMMODATING: The adjustable flow switch allows for increased or decreased water flow at will, which is extremely helpful during feeding times, or use it as needed. The directional flow nozzles allow for additional tank customization and convenience. Furthermore, the filter utilizes 4 suction cups, allowing for both vertical and horizontal mounting positions.
- FULLY SUBMERSIBLE: The Cascade 400 utilizes 2 filter media chambers, and comes with filter media: 1 refillable Carbon Cartridge and 1 Bio-Sponge. In addition to optimizing the colonization of anaerobic bacteria, this filter traps floating particulate matter, removes harmful chemicals and toxins, clears up discolorations, and reduces foul odors from your aquarium’s water.
- VENTURI AERATION: The Cascade 400 features Venturi Aeration, which provides your tank with filtered, oxygenated water. This feature eliminates the need for an air pump. Instead of two separate units, this filter combines both functions: simply connect the Air Tube and Air Muffler to the Flow Nozzle, and follow the included instructions. Please fully submerge and fill filter with water before turning on.
- AERATING SPRAY BAR: In addition to the two Flow Nozzles and the Venturi Aeration, the Cascade 400 includes a Spray Bar that evenly distributes filtered water over the surface of your aquarium.
- MEASUREMENTS: 9.5” (L) x 2.5” (W) x 2.75” (D)
Specs
- Aquarium filter typeAquarium Filter
- BrandPenn-Plax
- FeaturesFiltration, In-Tank
- Power typeCorded Electric
- Number of stages3-Stage
- Assembled product height9.5 in
- Free shipping
Free 30-day returns
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About this item
Product details
- QUIET & EFFICIENT: The Cascade 400 Submersible Filter quietly delivers crystal clear water throughout the aquarium. This filter cycles water at 110 Gallons per Hour (GPH) for tanks up to 20 Gallons in size. It’s great for Freshwater and Saltwater aquariums, along with a variety of Terrarium setups.
- ACCOMMODATING: The adjustable flow switch allows for increased or decreased water flow at will, which is extremely helpful during feeding times, or use it as needed. The directional flow nozzles allow for additional tank customization and convenience. Furthermore, the filter utilizes 4 suction cups, allowing for both vertical and horizontal mounting positions.
- FULLY SUBMERSIBLE: The Cascade 400 utilizes 2 filter media chambers, and comes with filter media: 1 refillable Carbon Cartridge and 1 Bio-Sponge. In addition to optimizing the colonization of anaerobic bacteria, this filter traps floating particulate matter, removes harmful chemicals and toxins, clears up discolorations, and reduces foul odors from your aquarium’s water.
- VENTURI AERATION: The Cascade 400 features Venturi Aeration, which provides your tank with filtered, oxygenated water. This feature eliminates the need for an air pump. Instead of two separate units, this filter combines both functions: simply connect the Air Tube and Air Muffler to the Flow Nozzle, and follow the included instructions. Please fully submerge and fill filter with water before turning on.
- AERATING SPRAY BAR: In addition to the two Flow Nozzles and the Venturi Aeration, the Cascade 400 includes a Spray Bar that evenly distributes filtered water over the surface of your aquarium.
- MEASUREMENTS: 9.5” (L) x 2.5” (W) x 2.75” (D)
Specifications
Aquarium filter type
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Warranty
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Customer ratings & reviews
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Showing 1-3 of 9 reviews
Verified Purchase
This might be the best small internal filter
This is possibly the best internal filter in the world. I'm not speaking in terms of price, volume, durability, or appearance. Rather, this might be the best filter in terms of actual effectiveness of filtration. There is a ton of surface area for bacteria to live on. I estimate that this filter's sponge could hold over 10 times as much bacteria as the Whisper filters. Basically, this is a great filter because it has a great sponge. With that said, it also is cheap, looks nice, is quiet, and easy to maintain. I have used hundreds of filters in my life, and this is the best one I've seen so far. It's better than filters that are twice the price.
Seller Verified Purchase
2in1
It do a good oxygenation and filtration my 20gal tank
Pond filter
I use this item to filter and airfare my 30 gallon koi pond on my patio. Couldn't ask for a better product!











