10 Best Undergravel Filter of December 2025

List of Top Rated Undergravel Filter from thousands of customer reviews & feedback.

Updated On Dec 2025

2,632 Reviews Studied

By Customer Ratings

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Penn Plax Premium Under Gravel Filter System - for 40-55 Gallon Fish Tanks & Aquariums, Blue (CFU55) Read Review

  • Undergravel filter system includes 4 filter plates (each measuring 11.5" X 11.5") with extra large 1 inch adjustable lift tubes.
  • Filter is suitable for most 40 and 50 gallon aquariums. Clips to hold each section securely together are included.
  • 2 carbon filter cartridges remove odors, and water discoloration by trapping the pollutants in the pores of the carbon.
  • This undergravel filter hides from view for maximum aesthetics. Safe for use in both freshwater and saltwater tanks.
  • Effortless setup and easy maintenance make this premium undergravel filter a must have for all home aquariums.  Simply place filter plates at the bottom of the tank and cover with gravel.

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Undergravel Filteration Bottom Circular Bar 45.3"x 9.6" Under Gravel Filter Tube Aquarium Read Review

  • Features of the Imagitarium Undergravel Filter, 55 Gallon
  • Works freshwater and saltwater tanks
  • Compatible with 55-gallon size tanks
  • connector 16mm .Pipe diameter 22mm.Circular bar tube is 16.6cm , Total 27 tubes.PVC tube is 16.6cm , Total 3 tube
  • Connector L Shape Joint , Total 7 pce

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Lee's 50/65 Premium Undergravel Filter, 18-Inch by 36-Inch Read Review

  • Country Of Origin: United States
  • Item Package Height: 16.5
  • Item Package Length: 17.625
  • Item Package Width: 3.125

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Penn-Plax Filt-a-Carb Replacement Activated Carbon Media Cartridges (2 Pack) – Fits Multi-Pore and Undergravel “E” Filte... Read Review

  • REPLACEMENT FILTER MEDIA: These Activated Carbon Cartridges are made to fit the lift tubes of Muti-Pore and Undergravel “E” filters, serving as a replacement for when it’s time to cycle out aquarium filter media.
  • CHEMICAL FILTRATION: In addition to absorbing ammonia, nitrites, nitrates, and phosphates in a timely manner, these Activated Carbon Cartridges also remove harmful chemicals and toxins, clear up discolorations, and reduce foul odors from your tank.
  • TOP-QUALITY ACTIVATED CARBON: These Activated Carbon Cartridges come together in a 2 Pack. For best results, replace cartridges every 2 to 4 weeks. They’re lightweight, disposable, and are safe for Freshwater and Saltwater aquariums.
  • OLD SCHOOL: There has been a burst of growth, development, and ingenuity within the aquatic industry, and although we are a part of this as well, we still provide replacement media for undergravel aquarium setups.
  • 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.

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Lee's 20L/29 Premium Undergravel Filter, 12-Inch by 30-Inch Read Review

  • This biological filter has a multi-level plate design.
  • The larger plate sizes reduce the number of plates required.
  • The added strength of the UGF plates makes this filter most preferred by saltwater aquarist.
  • The molded gravel guards eliminate the possibility of gravel falling down the uplift tube.
  • Made of special quality plastic which resists splitting and cracking.

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Penn Plax Filt-A-Carb for Multi-Pore and Undergravel E Filters- 6 Total (3 Packs with 2 per Pack) Read Review

  • 6 Total Filt-A-Carb Carbon Cartridges (3 Packs with 2 per pack)
  • Filt-A-Carb Carbon Cartridges are made with top quality activated carbon designed to remove harmful gasses and odors, while clearing up unsightly discoloration.
  • Undergravel Filter Cartridges are designed to keep your tank looking crystal clear.
  • Filter Cartridges fit Undertow "E" Filters.

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Penn Plax Premium Under Gravel Filter System - for 10 Gallon Fish Tanks & Aquariums Read Review

  • Includes filter plates, air Stones, adjustable lift tubes and filter cartridges
  • Provides powerful biological and chemical filtration
  • Keeps your tank looking crystal clear

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Penn Plax Premium Under Gravel Filter System - for 29 Gallon Fish Tanks & Aquariums Read Review

  • Includes filter plates, air Stones, adjustable lift tubes and filter cartridges
  • Provides powerful biological and chemical filtration
  • Keeps your (up to 29 gallon) tank looking crystal clear

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Penn Plax Premium Under Gravel Filter System - for 20 Gallon Fish Tanks & Aquariums Read Review

  • Includes filter plates, air Stones, adjustable lift tubes and filter cartridges
  • Provides powerful biological and chemical filtration
  • Keeps your 20 gallon fish Tank or aquarium looking crystal clear

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Lee's 125/135 Premium Undergravel Filter, 18-Inch by 72-Inch Read Review

  • Country Of Origin: United States
  • Item Package Height: 16.25
  • Item Package Length: 23.0
  • Item Package Width: 5.125