10 Best Undergravel Filter of December 2025

• 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.

Penn-Plax

• 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

Aquarium Equip

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

Lee's

• 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.

Penn-Plax

• 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.

Lee's

• 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.

Penn Plax

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

Penn-Plax

• 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

Penn-Plax

• 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

Penn-Plax

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

Lee's