Filters

Items 1 to 48 of 212 total

Despite having over 100 filters for sale, Big Al’s Pets make it easy to find the perfect match for your aquarium. Our aquarium filters are easily sorted into categories so you can provide your fish with the best filtration system for their needs. You’ll find everything from power filters to canister filters to modular filters on our site. Plus, we carry under-gravel filters, sponge filters, sump filters, and fluidized bed filters to accommodate any application or setup. Each one provides high-quality filtration to ensure the best water quality and clarity for your fish.

When choosing an aquarium filter, make sure you take into account the many factors which can affect filter performance. The size of your tank is a major determining factor in the type of filter that you require. For example, some larger tanks employ multiple filters to achieve the best water conditions. You’ll also need to consider other factors, such as how many and what types of fish you have in your aquarium. Take a closer look at our amazing selection of aquarium filters, and you’re sure to find one that meets your specific needs.
  • Lee's Triple-Flow Corner Filters
    Triple-Flow Corner Filters may be used for biological, chemical or mechanical filtration, with three intake vents. It features maximum efficiency for ideally breeder or isolation tanks, or used as a fundamental or back-up filter.

    Price From: USD 3.49

    Price From: USD 3.49

  • Aqueon QuietFlow E Internal Power Filter - 20 gal
    • Simple functionality for beginners and professionals
    • Easily attaches against the aquarium with suction cups
    • Use the hang-on feature, securing it with hang-on clips
    • Suitable with the Medium Replacement Filter Cartridge
    • Provides chemical, biological & mechanical filtration
    USD 20.99
    USD 20.99
  • Aqueon QuietFlow E Internal Power Filter - 3 gal
    • Simple functionality for beginners and professionals
    • Easily attaches against the aquarium with suction cups
    • Use the hang-on feature, securing it with hang-on clips
    • Suitable with the X-Small Replacement Filter Cartridge
    • This 3 gal model will only provide chemical filtration
    USD 10.49
    USD 10.49
  • Aqueon QuietFlow E Internal Power Filter - 40 gal
    • Simple functionality for beginners and professionals
    • Easily attaches against the aquarium with suction cups
    • Use the hang-on feature, securing it with hang-on clips
    • Suitable with the Large Replacement Filter Cartridge
    • Provides chemical, biological & mechanical filtration
    USD 25.99
    USD 25.99
  • Lee's Under Gravel Filter - 10 gal
    • Turn your gravel bed into a biological filter
    • Includes plates, airline tubing & uplift tubes
    • Includes air diffusers and carbon cartridges
    • Adjustable 1" uplift tubes for a better flow
    • This Filter could be used with a Powerhead

    Regular Price: USD 15.99

    Sale Price USD 8.99

    Regular Price: USD 15.99

    Sale Price USD 8.99

  • Lee's Under Gravel Filter - 30 Long
    • Turn your gravel bed into a biological filter
    • Includes plates, airline tubing & uplift tubes
    • Includes air diffusers and carbon cartridges
    • Adjustable 1" uplift tubes for a better flow
    • This Filter could be used with a Powerhead

    Regular Price: USD 22.99

    Sale Price USD 14.99

    Regular Price: USD 22.99

    Sale Price USD 14.99

  • Lee's Under Gravel Filter - 40/55 gal
    • Turn your gravel bed into a biological filter
    • Includes plates, airline tubing & uplift tubes
    • Includes air diffusers and carbon cartridges
    • Adjustable 1" uplift tubes for a better flow
    • This Filter could be used with a Powerhead

    Regular Price: USD 27.99

    Sale Price USD 19.99

    Regular Price: USD 27.99

    Sale Price USD 19.99

  • Seapora Nano Power Filter
    • Creates a clean & clear aquatic environment
    • Sponge media blocks are efficient & reusable
    • Maintenance is simple with just a quick rinse
    • Created with a durable hang-on filter design
    • For up to 7.5 gal tanks & desktop aquariums

    Regular Price: USD 13.99

    Sale Price USD 8.49

    Regular Price: USD 13.99

    Sale Price USD 8.49

  • Xaqua InOut Complete Overflow System
    • Complete easy-to-install drainage and return system
    • Mounted externally with no impact on tank volume
    • Rates for a maximum pump capacity of 660 gallons per hour
    • Hydrodynamic Pulsing feature reduces noise and creates waves
    • No moving parts and no additional fittings required
    USD 99.11
    USD 99.11
  • Seachem Tidal Power Filter 110
    • Upper most blue pegged integrated maintenance alert feature
    • Integrated self priming pump; thus no priming is required
    • Features a high capacity 3.2 L filter basket for optimal filtration
    • This super silent model is ideal for up to 110 gallon aquariums
    • Includes adjustable upper flow rate and lower intake knobs
    USD 82.00
    USD 82.00
  • Seachem Tidal Power Filter 55
    • Upper most blue pegged integrated maintenance alert feature
    • Integrated self priming pump; thus no priming is required
    • Features a high capacity 1.2 L filter basket for optimal filtration
    • This super silent model is ideal for up to 55 gallon aquariums
    • Includes adjustable upper flow rate and lower intake knobs
    USD 54.00
    USD 54.00

    Out of stock

  • Seachem Tidal Power Filter 75
    • Upper most blue pegged integrated maintenance alert feature
    • Integrated self priming pump; thus no priming is required
    • Features a high capacity 1.9 L filter basket for optimal filtration
    • This super silent model is ideal for up to 75 gallon aquariums
    • Includes adjustable upper flow rate and lower intake knobs
    USD 68.00
    USD 68.00
  • Pro Clear Aquatic Systems Freedom 4-in-1 Sump 100 - 16" (Cube)
    • Quiet, sturdy, easy to maintain saltwater filtration system
    • The Eurobrace around the rim of the sump prevents bowing
    • Notches for holding wires, dosing tubes & return pump tubing
    • Refugium can also be converted to a wet/dry trickle filter
    • Adjustable flow-gate through refugium section of the sump
    USD 298.88
    USD 298.88
  • Pro Clear Aquatic Systems Freedom 4-in-1 Sump 200 - 32"
    • Quiet, sturdy, easy to maintain saltwater filtration system
    • The Eurobrace around the rim of the sump prevents bowing
    • Notches for holding wires, dosing tubes & return pump tubing
    • Refugium can also be converted to a wet/dry trickle filter
    • Adjustable flow-gate through refugium section of the sump
    USD 348.88
    USD 348.88

    Out of stock

  • Pro Clear Aquatic Systems Freedom 4-in-1 Sump 300 - 37"
    • Quiet, sturdy, easy to maintain saltwater filtration system
    • The Eurobrace around the rim of the sump prevents bowing
    • Notches for holding wires, dosing tubes & return pump tubing
    • Refugium can also be converted to a wet/dry trickle filter
    • Adjustable flow-gate through refugium section of the sump
    USD 398.88
    USD 398.88
  • Aqueon QuietFlow E Internal Power Filter - 10 gal
    • Simple functionality for beginners and professionals
    • Easily attaches against the aquarium with suction cups
    • Use the hang-on feature, securing it with hang-on clips
    • Suitable with the Small Replacement Filter Cartridge
    • Provides chemical, biological & mechanical filtration
    USD 12.99
    USD 12.99
  • Lee's Under Gravel Filter - 20 L/29/26S gal
    • Turn your gravel bed into a biological filter
    • Includes plates, airline tubing & uplift tubes
    • Includes air diffusers and carbon cartridges
    • Adjustable 1" uplift tubes for a better flow
    • This Filter could be used with a Powerhead

    Regular Price: USD 26.99

    Sale Price USD 19.89

    Regular Price: USD 26.99

    Sale Price USD 19.89

    Out of stock

  • Lee's Triple-Flow Corner Filter - Small
    • Maximum efficiency for up to 45 gallon aquariums
    • This excellent model is made with three intake vents
    • Ideally used for beginners, breeder/ isolation tanks
    • Perfect solution for a fundamental or back-up filter
    • Use for biological, chemical or mechanical filtration

    Regular Price: USD 6.99

    Sale Price USD 3.49

    Regular Price: USD 6.99

    Sale Price USD 3.49

  • Pro Clear Aquatic Systems Freedom 4-in-1 Sumps
    • Quiet, sturdy, easy to maintain saltwater filtration system
    • The Eurobrace around the rim of the sump prevents bowing
    • Notches for holding wires, dosing tubes & return pump tubing
    • Refugium can also be converted to a wet/dry trickle filter
    • Adjustable flow-gate through refugium section of the sump

    Price From: USD 298.88

    Price From: USD 298.88

  • Pro Clear Aquatic Systems Freedom Reef Sumps
    • Quiet, sturdy, easy to maintain saltwater filtration system
    • The Eurobrace around the rim of the sump prevents bowing
    • Notches for holding wires, dosing tubes & return pump tubing
    • Adjustable flow-gate through the media container section
    • Bubble diffuser tubes help silence bubbles as water enters

    Price From: USD 198.88

    Price From: USD 198.88

  • Aqueon QuietFlow E Internal Power Filters
    • Suitable with the X-Small Replacement Filter Cartridge
    • This 3G model will only provide chemichal filtration

    Price From: USD 10.49

    Price From: USD 10.49

  • Lee's Premium Under Gravel Filters
    Premium Under Gravel Filters clean your fresh or saltwater aquarium through a biological filtering process which supports the growth of beneficial bacteria, allowing natural detoxification while maintaining proper ammonia balance.

    Price From: USD 15.99

    Price From: USD 15.99

  • Lee's Discard-a-Filter - 2 pk
    • Consists of carbon, zeolite and sponge filtration
    • Suitable for small aquariums or Kritter Keepers
    • This will keep water clean, clear and odor-free
    • Discard after use; approximately every month
    • Includes suction cup mounts for simple set-up

    Regular Price: USD 9.99

    Sale Price USD 6.49

    Regular Price: USD 9.99

    Sale Price USD 6.49

    Out of stock

  • Lee's Premium Under Gravel Filter - 10 gal
    • It circulates water flow through the gravel bed
    • Incorporates two Premium Carbon Cartridges
    • Includes Discard-a-Stone & a fish-saver elbow
    • The telescoping ring adjusts uplift tube height
    • Maximize water quality by using a power filter!

    Regular Price: USD 19.99

    Sale Price USD 15.99

    Regular Price: USD 19.99

    Sale Price USD 15.99

    Out of stock

  • Lee's Premium Under Gravel Filter - 125/135 gal
    • It circulates water flow through the gravel bed
    • Incorporates two Premium Carbon Cartridges
    • Includes Discard-a-Stone & a fish-saver elbow
    • The telescoping ring adjusts uplift tube height
    • Maximize water quality by using a power filter!

    Regular Price: USD 89.99

    Sale Price USD 69.99

    Regular Price: USD 89.99

    Sale Price USD 69.99

    Out of stock

  • Lee's Premium Under Gravel Filter - 15/20 gal
    • It circulates water flow through the gravel bed
    • Incorporates two Premium Carbon Cartridges
    • Includes Discard-a-Stone & a fish-saver elbow
    • The telescoping ring adjusts uplift tube height
    • Maximize water quality by using a power filter!

    Regular Price: USD 26.99

    Sale Price USD 17.49

    Regular Price: USD 26.99

    Sale Price USD 17.49

  • Lee's Premium Under Gravel Filter - 20 L/29 gal
    • It circulates water flow through the gravel bed
    • Incorporates two Premium Carbon Cartridges
    • Includes Discard-a-Stone & a fish-saver elbow
    • The telescoping ring adjusts uplift tube height
    • Maximize water quality by using a power filter!

    Regular Price: USD 29.99

    Sale Price USD 19.99

    Regular Price: USD 29.99

    Sale Price USD 19.99

  • Lee's Premium Under Gravel Filter - 30/45 gal
    • It circulates water flow through the gravel bed
    • Incorporates two Premium Carbon Cartridges
    • Includes Discard-a-Stone & a fish-saver elbow
    • The telescoping ring adjusts uplift tube height
    • Maximize water quality by using a power filter!

    Regular Price: USD 36.99

    Sale Price USD 24.99

    Regular Price: USD 36.99

    Sale Price USD 24.99

  • Lee's Premium Under Gravel Filter - 40/55 gal
    • It circulates water flow through the gravel bed
    • Incorporates two Premium Carbon Cartridges
    • Includes Discard-a-Stone & a fish-saver elbow
    • The telescoping ring adjusts uplift tube height
    • Maximize water quality by using a power filter!

    Regular Price: USD 43.99

    Sale Price USD 29.99

    Regular Price: USD 43.99

    Sale Price USD 29.99

  • Lee's Premium Under Gravel Filter - 50/65 gal
    • It circulates water flow through the gravel bed
    • Incorporates two Premium Carbon Cartridges
    • Includes Discard-a-Stone & a fish-saver elbow
    • The telescoping ring adjusts uplift tube height
    • Maximize water quality by using a power filter!

    Regular Price: USD 49.99

    Sale Price USD 36.99

    Regular Price: USD 49.99

    Sale Price USD 36.99

  • Lee's Premium Under Gravel Filter - 75/90 gal
    • It circulates water flow through the gravel bed
    • Incorporates two Premium Carbon Cartridges
    • Includes Discard-a-Stone & a fish-saver elbow
    • The telescoping ring adjusts uplift tube height
    • Maximize water quality by using a power filter!

    Regular Price: USD 56.99

    Sale Price USD 43.99

    Regular Price: USD 56.99

    Sale Price USD 43.99

  • Lee's Triple-Flow Corner Filter - Large
    • Maximum efficiency for up to 100 gallon aquariums
    • This excellent model is made with three intake vents
    • Ideally used for beginners, breeder/ isolation tanks
    • Perfect solution for a fundamental or back-up filter
    • Use for biological, chemical or mechanical filtration

    Regular Price: USD 9.99

    Sale Price USD 5.49

    Regular Price: USD 9.99

    Sale Price USD 5.49

  • Pro Clear Aquatic Systems Freedom 4-in-1 Sump 400 - 45"
    • Quiet, sturdy, easy to maintain saltwater filtration system
    • The Eurobrace around the rim of the sump prevents bowing
    • Notches for holding wires, dosing tubes & return pump tubing
    • Refugium can also be converted to a wet/dry trickle filter
    • Adjustable flow-gate through refugium section of the sump
    USD 448.88
    USD 448.88
  • Pro Clear Aquatic Systems Freedom Reef Sump 100 - 24"
    • Quiet, sturdy, easy to maintain saltwater filtration system
    • The Eurobrace around the rim of the sump prevents bowing
    • Notches for holding wires, dosing tubes & return pump tubing
    • Adjustable flow-gate through the media container section
    • Bubble diffuser tubes help silence bubbles as water enters
    USD 198.88
    USD 198.88

    Out of stock

  • Seachem Tidal Power Filters
    • Upper most blue pegged integrated maintenance alert feature
    • Integrated self priming pump; thus no priming is required
    • Features a high capacity 1.2 L filter basket for optimal filtration
    • This super silent model is ideal for up to 55 gallon aquariums
    • Includes adjustable upper flow rate and lower intake knobs

    Price From: USD 54.00

    Price From: USD 54.00

  • Lee's Under Gravel Filters
    Designed with adjustable 1" diameter uplift tubes for better water circulation and multiple-plate construction for easy installation. Advanced design allows a separate plate installation and also has optional flow-thru set-up for use with a power head.

    Price From: USD 8.99

    Price From: USD 8.99

  • Pro Clear Aquatic Systems Freedom Reef Sump 200 - 32"
    • Quiet, sturdy, easy to maintain saltwater filtration system
    • The Eurobrace around the rim of the sump prevents bowing
    • Notches for holding wires, dosing tubes & return pump tubing
    • Adjustable flow-gate through the media container section
    • Bubble diffuser tubes help silence bubbles as water enters
    USD 248.88
    USD 248.88

    Out of stock

  • Pro Clear Aquatic Systems Freedom Reef Sump 300 - 37"
    • Quiet, sturdy, easy to maintain saltwater filtration system
    • The Eurobrace around the rim of the sump prevents bowing
    • Notches for holding wires, dosing tubes & return pump tubing
    • Adjustable flow-gate through the media container section
    • Bubble diffuser tubes help silence bubbles as water enters
    USD 298.88
    USD 298.88

    Out of stock

  • Pro Clear Aquatic Systems Freedom Reef Sump 400 - 45"
    • Quiet, sturdy, easy to maintain saltwater filtration system
    • The Eurobrace around the rim of the sump prevents bowing
    • Notches for holding wires, dosing tubes & return pump tubing
    • Adjustable flow-gate through the media container section
    • Bubble diffuser tubes help silence bubbles as water enters
    USD 348.88
    USD 348.88
  • Fluval FX High Performance Canister Filters
    • Powerful canister filter has a 450 gph flow rate on 30 watts
    • Smart Pump Technology (SPT) ensures optimal performance
    • Includes all the media required for highly effective filtration
    • This mega capacity filter holds 3.9 L (1 gal) of filter media
    • Suitable for freshwater or marine aquariums up to 250 gal

    Price From: USD 279.99

    Price From: USD 279.99

  • Lee's Sponge Filters
    Composed of open-celled foam which provides enormous amounts of usable surface area for beneficial bacteria to colonize. Excellent for breeding all types of aquarium fish, as well as for hatching and raising brine shrimp.

    Price From: USD 5.99

    Price From: USD 5.99

  • Seachem Foam for Tidal 35 - 2 pk
    Description Coming Soon!
    USD 3.49
    USD 3.49
  • Aqueon QuietFlow Internal Shrimp Filter - 20
    Description Coming Soon!

    Regular Price: USD 24.99

    Sale Price USD 17.99

    Regular Price: USD 24.99

    Sale Price USD 17.99

  • Wavereef Internal Overflow Box - 660 gph
    Description Coming Soon!

    Regular Price: USD 42.99

    Sale Price USD 29.99

    Regular Price: USD 42.99

    Sale Price USD 29.99

  • Wavereef Algae Reactor with LED Lighting
    • A unique and safe method of natural filtration
    • Removes algae-producing nutrients from water
    • Inner LEDs provide safe high quality lighting
    • Stabilizes pH and and lowers dissolved CO2 levels
    • Low wattage and safe operation with heat sink

    Regular Price: USD 189.99

    Sale Price USD 149.99

    Regular Price: USD 189.99

    Sale Price USD 149.99

  • Pro Clear Aquatic Systems Freedom Flex - 300

    Regular Price: USD 399.99

    Sale Price USD 349.99

    Regular Price: USD 399.99

    Sale Price USD 349.99

  • Pro Clear Aquatic Systems Freedom Flex - 400

    Regular Price: USD 449.99

    Sale Price USD 399.99

    Regular Price: USD 449.99

    Sale Price USD 399.99

  • Trigger Systems Sapphire Sumps
    Sapphire Series sumps combine function, efficiency, and style into high quality filtration systems that are hand-crafted in the U.S.A. With interchangeable plates, self-adjusting foam block platform, splash lid, sappire coloring to block light, and more!

    Price From: USD 324.99

    Price From: USD 324.99

    Out of stock

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