Hero image 0 of Penn-Plax Premium Under Gravel Filter System for 40-55 Gallon Tanks, 0 of 3
Penn-Plax Premium Under Gravel Filter System for 40-55 Gallon Tanks
Key item features
- NOTHING LIKE OLD SCHOOL: The Clear-Free Premium Under Gravel Filter is air driven and utilizes an Air Pump (not included) to cycle crystal clear water throughout your aquarium, while keeping a crisp and neat look inside. This means there’s less “moving parts,” making for simplistic and easy maintenance. This filter is suitable for most 40 – 55 gallon aquariums.
- BIOLOGICAL, CHEMICAL, AND PHYSICAL FILTRATION: As air is pushed through the Air Stones and rises through the Lift Tubes, water is gently suctioned through gravel and the filter plates, allowing both air and water to pass through the Filt-a-Carb Activated Carbon Cartridges. When water continues to be drawn through, anaerobic bacteria collects and colonizes within the gravel and filter plates.
- ALSO AERATES YOUR TANK: Since the Clear-Free Premium Under Gravel Filter is air driven through the use of Air Stones and an Air Pump (not included), it also aerates your tank. In essence, your aquarium is being filtered and aerated at the same time, though the same system! It’s a filter and bubbler in 1!
- ITEMS INCLUDED: The Clear-Free Premium Under Gravel Filter includes 4 Filter Plates, 4 Adjustable Lift Tubes, 4 Straight Airline Tubes, 9 Filter Plate Connecters, and 4 Replaceable Filt-a-Carb Activated Carbon Media Cartridges.
- MEASUREMENTS: Each Filter Plate Separately = 11.25” (W) x 11.25” (D) / Filter Plates Together = 45” (W) x 11.25” (D) / Each Lift Tube at Filter Plate Base = 13.25” – 16.5”
Specs
- FeaturesBiological, Chemical
- ModelCFU55
- Power typeElectric
Current price is USD$29.99
Price when purchased online
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About this item
Product details
Provides powerful biological and chemical filtration Trouble free setup and operation Includes filter plates, air stones, adjustable lift tubes and filter cartridges Available for 5, 10, 15/20H, 20L/29, 40 / 55 gallon aquariums. BIOLOGICAL, CHEMICAL, AND PHYSICAL FILTRATION: As air is pushed through the Air Stones and rises through the Lift Tubes, water is gently suctioned through gravel and the filter plates, allowing both air and water to pass through the Filt-a-Carb Activated Carbon Cartridges. When water continues to be drawn through, anaerobic bacteria collects and colonizes within the gravel and filter plates.
- NOTHING LIKE OLD SCHOOL: The Clear-Free Premium Under Gravel Filter is air driven and utilizes an Air Pump (not included) to cycle crystal clear water throughout your aquarium, while keeping a crisp and neat look inside. This means there’s less “moving parts,” making for simplistic and easy maintenance. This filter is suitable for most 40 – 55 gallon aquariums.
- BIOLOGICAL, CHEMICAL, AND PHYSICAL FILTRATION: As air is pushed through the Air Stones and rises through the Lift Tubes, water is gently suctioned through gravel and the filter plates, allowing both air and water to pass through the Filt-a-Carb Activated Carbon Cartridges. When water continues to be drawn through, anaerobic bacteria collects and colonizes within the gravel and filter plates.
- ALSO AERATES YOUR TANK: Since the Clear-Free Premium Under Gravel Filter is air driven through the use of Air Stones and an Air Pump (not included), it also aerates your tank. In essence, your aquarium is being filtered and aerated at the same time, though the same system! It’s a filter and bubbler in 1!
- ITEMS INCLUDED: The Clear-Free Premium Under Gravel Filter includes 4 Filter Plates, 4 Adjustable Lift Tubes, 4 Straight Airline Tubes, 9 Filter Plate Connecters, and 4 Replaceable Filt-a-Carb Activated Carbon Media Cartridges.
- MEASUREMENTS: Each Filter Plate Separately = 11.25” (W) x 11.25” (D) / Filter Plates Together = 45” (W) x 11.25” (D) / Each Lift Tube at Filter Plate Base = 13.25” – 16.5”
info:
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Specifications
Features
Biological, Chemical
Model
CFU55
Power type
Electric
Aquarium filter type
Under Gravel Aquarium Filter
Directions
Instructions
Easy Set-up Instructions Enclosed,See Reverse Side for Details
Warranty
Warranty information
Please be aware that the warranty terms on items offered for sale by third party Marketplace sellers may differ from those displayed in this section (if any). To confirm warranty terms on an item offered for sale by a third party Marketplace seller, please use the 'Contact seller' feature on the third party Marketplace seller's information page and request the item's warranty terms prior to purchase.
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Showing 1-3 of 13 reviews
Jul 7, 2025
Mark
5 out of 5 stars review
Verified Purchase
old school, but great!!!
im old school had tanks for 30 plus years and I love the under gravel filters constantly drawing water through your substrate is great for establishing a great place for you positive bacteria to grow. Vacuum on a regular basis and you have it made . this, and a couple power heads on each end and your set. good product!!!
Helpful?7JSY0HSZ0VDX121878262
Oct 20, 2025
Taz
5 out of 5 stars review
Verified Purchase
it's very thin delicate plastic be careful when installing. Great fit plenty of tubing and charcoal cartridges for all for corners!!
Helpful?7JSY0HSZ0VDX121878262
Nov 1, 2024
Nicole
5 out of 5 stars review
Verified Purchase
Old school
Before I purchased this my fish tank water would cloud up fast, now it is crystal clear . There is nothing wrong with going old school like they say, If it's not broke don't fix it.. I will be purchasing more for my other two tanks
Helpful?7JSY0HSZ0VDX121878262
