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Undergravel Filter 5 Gallon

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The Best Undergravel Filter 5 Gallon of 2023 – Reviewed and Top Rated

2,132 Reviews Scanned

Rank No. #1
Penn-Plax Undergravel Aquarium Filter for 15-20 (high) Gallon Tanks – Two 11.2” x 11.25” Plates – Under Gravel System for Clear, Clean Water – Safe for Freshwater and Saltwater Tanks
  • 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 15 – 20 (high) 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 2 Filter Plates, 2 Adjustable Lift Tubes, 2 Straight Airline Tubes, 3 Filter Plate Connecters, and 2 Replaceable Filt-a-Carb Activated Carbon Media Cartridges.
  • MEASUREMENTS: Each Filter Plate Separately = 11.25” (W) x 11.2” (D) / Filter Plates Together = 22.5” (W) x 11.2” (D) / Each Lift Tube at Filter Plate Base = 12” – 15”
Rank No. #2
Penn-Plax Undergravel Aquarium Filter for 40-55 Gallon Tanks – Four 11.25” x 11.25” Plates – Under Gravel System for Clear, Clean Water – Safe for Freshwater and Saltwater Tanks (CFU55)
  • 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”
SaleRank No. #3
Lee's Pet Products ALE13200 Undergravel Fishbowl Filter, 1-Gallon
  • Lees under gravel fishbowl filter 1galoon
  • Minimizes maintenance responsibility
  • Comes with plant and carbon cartridge included
Rank No. #4
AQUANEAT 3 Pack Aquarium Bio Sponge Filter Breeding Fry Betta Shrimp Nano Fish Tank (Small up to 10Gal)
  • Sponge filter provide both mechanical and bio filtration, also, the air infusion chamber produces minute bubbles which increase the oxygen solubility
  • Safe for fish: soft sponge material, traps floating debris and won't suck up your fish
  • Easy to set up & clean: simply install an airline into the unit and turn on the air pump, simply rinse and squeeze sponge in tank water
  • Recommend tank size: up to 10 gallon, excellent for small size fish like betta, dwarf cichlid, guppy, killifish etc., or for hatcheries, maternity tanks, nano tanks and fry tanks, as the filter produces minimal current and has almost no way to suck the fish through the filter
  • Includes: 3 pcs of sponge filter. Dimension: 2.0"D X 4.75"H
Rank No. #5
CORISRX Under Gravel Filter 7.8"x5.5" Undergravel Filteration for Fish Tank Air Pump
  • To maintain the cleanliness of your aquarium, it is important to circulate the water beneath the gravel layer. Our Flow Undergravel Filter is specifically designed as a biological filtration system for both freshwater and saltwater aquariums.
  • The pipe diameter is suitable for use with various types of filters, submersible pumps, or external filters. It provides versatility and compatibility with different equipment.
  • Included in the package is one Undergravel Filter measuring 19.9x14cm (7.8"x5.5").
  • This filter effectively utilizes the gravel bed, providing a large surface area for Nitrobacteria to thrive and contribute to water clarity.
  • By utilizing our Undergravel Filter, you can enjoy a clean and well-maintained aquarium environment.

Last update on 2025-07-13 / Affiliate links / Product Titles, Images, Descriptions from Amazon Product Advertising API

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FAQ:

Q: What should you do with an undergravel filter?

A: Undergravel filters are perhaps the cheapest types of filters you can find. They’re easy to set up , do a surprisingly solid job and are especially good for smaller fish tanks. You should definitely use an undergravel filter if your tank is undemanding – whether it’s a breeding tank, a quarantine tank, or just a simple Betta fish tank.

Q: What is a good filter for a 5 gallon tank?

A: Generally speaking, HOB (hang on back filters) are the best filter you can have in a 5 gallon tank. They allow more space in your tank while not being as expensive as canister filters. (however, they’re also not as effective as canister filters.)

Q: Are Undergravel filters good in aquariums?

A: Undergravel filters are generally not recommended as the sole source of filtration in an aquarium. This type of filter can be beneficial, however, as a supplemental source of biological filtration.

Q: How does undergravel filtration work?

A: Using an undergravel filter (UGF) is a tried and true method of filtering the water in a fish tank or aquarium. Undergravel filters work by pulling water and impurities downward through the gravel at the bottom of the tank. Rather than relying on a filter to clean the water,…

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