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The Three Types of Water Filtration (1) Mechanical filtration of water is done by passing the water through a screen, or a thin piece of sponge, or through a floss material, all of which remove pieces of debris from the water. (2) Chemical filtration of water is done by passing the water through small pieces of carbon or zeolite, which is a natural mineral. The carbon or zeolite remove molecules such as ammonia from the water. (3) Biological filtration of water is done by certain types of bacteria that live on gravel, on the surface of glass, on ceramic ornaments, on plastic plants, on bio-balls, on floss.

At AquaCave, we offer some of the best selection and best prices on Aquarium Filters, Saltwater Fish Tank Filters, Reef Sumps, Canister Filters, Media Reactors, Protein Skimmers, UV, and Wet-Dry for your marine, reef, and freshwater aquariums.

  • Aqua Ultraviolet ULTIMA II 60000 Filter, 3" - Side Mount Aqua Ultraviolet ULTIMA II 60000 Filter, 3" - Side Mount Aqua Ultraviolet ULTIMA II 60000 Filter, 3" - Side Mount

    Aqua Ultraviolet

    Aqua Ultraviolet ULTIMA II 60000 Filter, 3" - Side Mount

    Aqua Ultraviolet ULTIMA II 60000 Filter, 3" - Side Mount The ‘Y’ shape and the inside wings on the outside affords a protective surface under the back washing and the company’s patent-pending backwash system will keep the media from...

    $9,329.95
  • Aqua Ultraviolet ULTIMA II 30000 Filter, 3" - Side Mount Aqua Ultraviolet ULTIMA II 30000 Filter, 3" - Side Mount Aqua Ultraviolet ULTIMA II 30000 Filter, 3" - Side Mount

    Aqua Ultraviolet

    Aqua Ultraviolet ULTIMA II 30000 Filter, 3" - Side Mount

    Aqua Ultraviolet ULTIMA II 30000 Filter, 3" - Side Mount The ‘Y’ shape and the inside wings on the outside affords a protective surface under the back washing and the company’s patent-pending backwash system will keep the media from...

    $6,572.93
  • Aqua Ultraviolet ULTIMA II 30000 Filter, 2" Valve Aqua Ultraviolet ULTIMA II 30000 Filter, 2" Valve Aqua Ultraviolet ULTIMA II 30000 Filter, 2" Valve

    Aqua Ultraviolet

    Aqua Ultraviolet ULTIMA II 30000 Filter, 2" Valve

    Aqua Ultraviolet ULTIMA II 30000 Filter, 2" Valve The ‘Y’ shape and the inside wings on the outside affords a protective surface under the back washing and the company’s patent-pending backwash system will keep the media from clogging...

    $4,818.45
  • Aqua Ultraviolet ULTIMA II 20000 Filter, 2" Valve Aqua Ultraviolet ULTIMA II 20000 Filter, 2" Valve Aqua Ultraviolet ULTIMA II 20000 Filter, 2" Valve

    Aqua Ultraviolet

    Aqua Ultraviolet ULTIMA II 20000 Filter, 2" Valve

    Aqua Ultraviolet ULTIMA II 20000 Filter, 2" Valve The ‘Y’ shape and the inside wings on the outside affords a protective surface under the back washing and the company’s patent-pending backwash system will keep the media from...

    $3,856.27
  • Aqua Ultraviolet ULTIMA II 10000 Filter, 2" Valve Aqua Ultraviolet ULTIMA II 10000 Filter, 2" Valve Aqua Ultraviolet ULTIMA II 10000 Filter, 2" Valve

    Aqua Ultraviolet

    Aqua Ultraviolet ULTIMA II 10000 Filter, 2" Valve

    Aqua Ultraviolet ULTIMA II 10000 Filter, 2" Valve The ‘Y’ shape and the inside wings on the outside affords a protective surface under the back washing and the company’s patent-pending backwash system will keep the media from clogging...

    $3,199.88
  • Aqua Ultraviolet ULTIMA II 6000 Filter, 2" Valve Aqua Ultraviolet ULTIMA II 6000 Filter, 2" Valve

    Aqua Ultraviolet

    Aqua Ultraviolet ULTIMA II 6000 Filter, 2" Valve

    Aqua Ultraviolet ULTIMA II 6000 Filter, 2" Valve The ‘Y’ shape and the inside wings on the outside affords a protective surface under the back washing and the company’s patent-pending backwash system will keep the media from clogging...

    $2,390.25
  • Aqua Ultraviolet ULTIMA II 4000 Filter, 1 1/2" Valve Aqua Ultraviolet ULTIMA II 4000 Filter, 1 1/2" Valve

    Aqua Ultraviolet

    Aqua Ultraviolet ULTIMA II 4000 Filter, 1 1/2" Valve

    Aqua Ultraviolet ULTIMA II 4000 Filter, 1 1/2" Valve The ‘Y’ shape and the inside wings on the outside affords a protective surface under the back washing and the company’s patent-pending backwash system will keep the media from...

    $2,340.95
  • Aqua Ultraviolet ULTIMA II 2000 Filter, 1 1/2" Valve Aqua Ultraviolet ULTIMA II 2000 Filter, 1 1/2" Valve Aqua Ultraviolet ULTIMA II 2000 Filter, 1 1/2" Valve

    Aqua Ultraviolet

    Aqua Ultraviolet ULTIMA II 2000 Filter, 1 1/2" Valve

    Aqua Ultraviolet ULTIMA II 2000 Filter, 1 1/2" Valve To support aquatic life whether at an aquaculture facility, backyard pond or large aquarium system it is essential to remove both ammonia and accumulated debris. The most efficient way to accomplish...

    $1,731.80
  • Trigger Systems Platinum 39 Sump Trigger Systems Platinum 39 Sump Trigger Systems Platinum 39 Sump Trigger Systems Platinum 39 Sump Trigger Systems Platinum 39 Sump

    Trigger Systems

    Trigger Systems Platinum 39 Sump

    Trigger Systems Platinum 39 Sump Dimensions: 39″ long x 16″ wide x 17″ high Fleece roll: 10″ wide x 150 feet long Middle Section: 22.75″ x 15.5″ Return Pump Section: 6″ x 15.5″ Total Water Volume: 40...

    $1,220.99
  • Aqua Ultraviolet ULTIMA II 1000 Filter W/1 1/2" Valve Aqua Ultraviolet ULTIMA II 1000 Filter W/1 1/2" Valve

    Aqua Ultraviolet

    Aqua Ultraviolet ULTIMA II 1000 Filter W/1 1/2" Valve

    Aqua Ultraviolet ULTIMA II 1000 Filter W/1 1/2" Valve The Aqua Ultravioliet Ultima II Filter is available in four standard models suitable for ponds from 1,000 to 20,000 gallons capacity. Aqua Ultraviolet claims that its biological filters take only...

    $1,127.90
  • Arias A6000-100 Sand Filter Arias A6000-100 Sand Filter Arias A6000-100 Sand Filter

    Pentair Aquatics

    Arias A6000-100 Sand Filter

    Arias A6000-100 Sand Filter Fiberglass tank with multiport valve, clamp style These Pentair Aquatic Eco-Systems sand filters have been a favorite of aquaculturists for years—a testament to their performance, value and ease of use. But not all sand...

    $910.15
  • Sedna Filter S1000-200-AQ Sedna Filter S1000-200-AQ Sedna Filter S1000-200-AQ

    Pentair Aquatics

    Sedna Filter S1000-200-AQ

    Sedna Filter S1000-200-AQ Get top-end filter performance with low maintenance! The single-piece base/tank is constructed of fiberglass-reinforced polypropylene for improved strength and chemical resistance. Fiberglass-reinforced cartridge filter Get...

    $746.12
  • Sedna Filter S1000-150-AQ Sedna Filter S1000-150-AQ Sedna Filter S1000-150-AQ

    Pentair Aquatics

    Sedna Filter S1000-150-AQ

    Sedna Filter S1000-150-AQ Get top-end filter performance with low maintenance! The single-piece base/tank is constructed of fiberglass-reinforced polypropylene for improved strength and chemical resistance. Fiberglass-reinforced cartridge filter Get...

    $640.54
  • Arias A6000-60 Sand Filter Arias A6000-60 Sand Filter Arias A6000-60 Sand Filter

    Pentair Aquatics

    Arias A6000-60 Sand Filter

    Arias A6000-60 Sand Filter Fiberglass tank with multiport valve, clamp style These Pentair Aquatic Eco-Systems sand filters have been a favorite of aquaculturists for years—a testament to their performance, value and ease of use. But not all sand...

    $593.79
  • Arias A6000-40 Sand Filter Arias A6000-40 Sand Filter Arias A6000-40 Sand Filter

    Pentair Aquatics

    Arias A6000-40 Sand Filter

    Arias A6000-40 Sand Filter Fiberglass tank with multiport valve, clamp style These Pentair Aquatic Eco-Systems sand filters have been a favorite of aquaculturists for years—a testament to their performance, value and ease of use. But not all sand...

    $564.98
  • Eheim Professionel 5e 700 Canister Filter Eheim Professionel 5e 700 Canister Filter

    Eheim

    Eheim Professionel 5e 700 Canister Filter

    Eheim Professionel 5e 700 Canister Filter The EHEIM professionel 5e offers you unique intelligence and several functional advantages.The EHEIM professionel 5e is our best external filter to date, offering everything an aquarium enthusiast could wish for...

    $529.99
  • AquaEL HYPERMAX 4500 Canister Filter AquaEL HYPERMAX 4500 Canister Filter AquaEL HYPERMAX 4500 Canister Filter AquaEL HYPERMAX 4500 Canister Filter AquaEL HYPERMAX 4500 Canister Filter

    AquaEL HYPERMAX 4500 Canister Filter

    AquaEL HYPERMAX 4500 Canister Filter Hypermax is a state-of-the-art canister filter that will provide excellent filtration quality even in the largest aquarium tanks. Intuitiveness, electronic operation and safety of use make the filter suitable for both...

    $499.99
  • Sedna Filter S1000-100-AQ Sedna Filter S1000-100-AQ Sedna Filter S1000-100-AQ

    Pentair Aquatics

    Sedna Filter S1000-100-AQ

    Sedna Filter S1000-100-AQ Get top-end filter performance with low maintenance! The single-piece base/tank is constructed of fiberglass-reinforced polypropylene for improved strength and chemical resistance. Fiberglass-reinforced cartridge filter Get...

    $480.50
  • Eheim Professionel 5e 450 Canister Filter Eheim Professionel 5e 450 Canister Filter Eheim Professionel 5e 450 Canister Filter

    Eheim

    Eheim Professionel 5e 450 Canister Filter

    Eheim Professionel 5e 450 Canister Filter The EHEIM professionel 5e offers you unique intelligence and several functional advantages.The EHEIM professionel 5e is our best external filter to date, offering everything an aquarium enthusiast could wish for...

    $469.99
  • Oase BioMaster Thermo 850 External Filter with Heater Oase BioMaster Thermo 850 External Filter with Heater Oase BioMaster Thermo 850 External Filter with Heater Oase BioMaster Thermo 850 External Filter with Heater Oase BioMaster Thermo 850 External Filter with Heater

    OASE

    Oase BioMaster Thermo 850 External Filter with Heater

    Oase BioMaster Thermo 850 External Filter with Heater Integrated heater – Provides precise and uniform temperature levels and reduces the amount of equipment seen inside the aquarium by housing the heater in the unit EasyClean pre-filter module –...

    $465.99
  • ClariSea SK-5000 Auto Roller Filter, Gen. 3 ClariSea SK-5000 Auto Roller Filter, Gen. 3 ClariSea SK-5000 Auto Roller Filter, Gen. 3

    ClariSea

    ClariSea SK-5000 Auto Roller Filter, Gen. 3

    ClariSea SK-5000 Auto Roller Filter, Gen. 3 The ClariSea Gen3 fleece filters are the latest generation in our market leading, patented, roll filter system. Building on extensive research and development this new version incorporates all the changes and...

    $445.00
  • Oase BioMaster 850 External Filter Oase BioMaster 850 External Filter Oase BioMaster 850 External Filter Oase BioMaster 850 External Filter Oase BioMaster 850 External Filter

    OASE

    Oase BioMaster 850 External Filter

    Oase BioMaster 850 External Filter EasyClean pre-filter module – Module can be removed separately from the rest of the filter. This reduces maintenance, increases filter efficiency, and extends the life of main filter foams. Customize the pre-filter...

    $416.99
  • Oase BioMaster Thermo 600 External Filter with Heater Oase BioMaster Thermo 600 External Filter with Heater Oase BioMaster Thermo 600 External Filter with Heater Oase BioMaster Thermo 600 External Filter with Heater Oase BioMaster Thermo 600 External Filter with Heater

    OASE

    Oase BioMaster Thermo 600 External Filter with Heater

    Oase BioMaster Thermo 600 External Filter with Heater Integrated heater – Provides precise and uniform temperature levels and reduces the amount of equipment seen inside the aquarium by housing the heater in the unit EasyClean pre-filter module –...

    $400.99
  • Trigger Systems Titanium Sump Fleece Roller Kit 10" Trigger Systems Titanium Sump Fleece Roller Kit 10"

    Trigger Systems

    Trigger Systems Titanium Sump Fleece Roller Kit 10"

    Trigger Systems Titanium Sump Fleece Roller Kit 10" Titanium Sump Fleece Roller Upgrade Kit Compatible with Trigger Titanium Sumps Sensor or Timer Modes Wide 10" Fleece Roll Two Rolls Included   Automatic fleece roller kit for the Trigger...

    $379.99
  • Red Sea Reef-Mat 1200 Smart Roller Filter Red Sea Reef-Mat 1200 Smart Roller Filter Red Sea Reef-Mat 1200 Smart Roller Filter Red Sea Reef-Mat 1200 Smart Roller Filter Red Sea Reef-Mat 1200 Smart Roller Filter

    Red Sea

    Red Sea Reef-Mat 1200 Smart Roller Filter

    Red Sea ReefMat 1200 Smart Roller Filter The Reef Mat is a plug & play, fully automated, smart fleece roller filter that keeps your aquarium water crystal clear for weeks at a time. Designed with the hobbyist in mind, the ReefMat features an easy...

    Was: $429.00
    Now: $377.52
  • Sedna Filter S1000-75-AQ Sedna Filter S1000-75-AQ Sedna Filter S1000-75-AQ

    Pentair Aquatics

    Sedna Filter S1000-75-AQ

    Sedna Filter S1000-75-AQ Get top-end filter performance with low maintenance! The single-piece base/tank is constructed of fiberglass-reinforced polypropylene for improved strength and chemical resistance. Fiberglass-reinforced cartridge filter Get...

    $376.51
  • Eheim Professionel 5e 350 Canister Filter Eheim Professionel 5e 350 Canister Filter

    Eheim

    Eheim Professionel 5e 350 Canister Filter

    Eheim Professionel 5e 350 Canister Filter The EHEIM professionel 5e offers you unique intelligence and several functional advantages.The EHEIM professionel 5e is our best external filter to date, offering everything an aquarium enthusiast could wish for...

    $374.99
  • Fluval FX6 Canister Filter  Fluval FX6 Canister Filter  Fluval FX6 Canister Filter  Fluval FX6 Canister Filter  Fluval FX6 Canister Filter

    Fluval

    Fluval FX6 Canister Filter

    Hagen Fluval FX6 Canister FilterFluval FX6 High Performance Canister Filter makes aquarium maintenance easier and more conveneint than ever. This high capacity, but compact, canister filter processes and circulates 563 GPH and has a large media capacity...

    $369.99
  • Oase BioMaster 600 External Filter Oase BioMaster 600 External Filter Oase BioMaster 600 External Filter Oase BioMaster 600 External Filter Oase BioMaster 600 External Filter

    OASE

    Oase BioMaster 600 External Filter

    Oase BioMaster 600 External Filter EasyClean pre-filter module – Module can be removed separately from the rest of the filter. This reduces maintenance, increases filter efficiency, and extends the life of main filter foams. Customize the pre-filter...

    $349.99
  • Red Sea Reef-Mat 500 Smart Roller Filter Red Sea Reef-Mat 500 Smart Roller Filter Red Sea Reef-Mat 500 Smart Roller Filter Red Sea Reef-Mat 500 Smart Roller Filter Red Sea Reef-Mat 500 Smart Roller Filter

    Red Sea

    Red Sea Reef-Mat 500 Smart Roller Filter

    Red Sea ReefMat 500 Smart Roller Filter The Reef Mat is a plug & play, fully automated, smart fleece roller filter that keeps your aquarium water crystal clear for weeks at a time. Designed with the hobbyist in mind, the ReefMat features an easy...

    Was: $379.00
    Now: $333.52
  • Eheim Classic Vario+e 250 Canister Filter - WiFi Eheim Classic Vario+e 250 Canister Filter - WiFi Eheim Classic Vario+e 250 Canister Filter - WiFi

    Eheim

    Eheim Classic Vario+e 250 Canister Filter - WiFi

    Eheim Classic Vario+e 250 Canister Filter - WiFi Eheim classicVARIO+e - the smart version of the classic filter, proven millions of times, with wireless electronic control and the world’s unique BLDC pump in an external filter. With the EHEIM...

    $319.99
  • Oase BioMaster Thermo 350 External Filter with Heater Oase BioMaster Thermo 350 External Filter with Heater Oase BioMaster Thermo 350 External Filter with Heater Oase BioMaster Thermo 350 External Filter with Heater Oase BioMaster Thermo 350 External Filter with Heater

    OASE

    Oase BioMaster Thermo 350 External Filter with Heater

    Oase BioMaster Thermo 350 External Filter with Heater Integrated heater – Provides precise and uniform temperature levels and reduces the amount of equipment seen inside the aquarium by housing the heater in the unit EasyClean pre-filter module –...

    $319.99
  • ClariSea SK-3000 Auto Roller Filter, Gen. 3 ClariSea SK-3000 Auto Roller Filter, Gen. 3

    ClariSea

    ClariSea SK-3000 Auto Roller Filter, Gen. 3

    ClariSea SK-3000 Auto Roller Filter, Gen. 3 The ClariSea Gen 3 fleece filters are the latest generation in our market leading, patented, roll filter system. Building on extensive research and development this new version incorporates all the changes and...

    Was: $399.00
    Now: $319.20
  • Fluval FX2 Canister Filter Fluval FX2 Canister Filter Fluval FX2 Canister Filter Fluval FX2 Canister Filter Fluval FX2 Canister Filter

    Fluval

    Fluval FX2 Canister Filter

    Fluval FX2 Canister Filter Designed for aquariums up to 175 US Gal / 750 L, the All-New FX2 filter packs high-level performance into the series’ most space-saving and affordable design to date. Features Multi-stage filter pumps out 475 US Gal / 1800...

    $309.99
  • Fluval FX4 Canister filter  Fluval FX4 Canister filter  Fluval FX4 Canister filter

    Fluval

    Fluval FX4 Canister filter

    Fluval FX4 Canister filter   Is a compact 'little brother' to the FX6. The FX4 bridges the gap between the Fluval 406 and the FX6 canister filter. Building on the mighty FX performance and reliability platform, the all-new FX4 high performance...

    $309.99
  • Sedna Filter S1000-50-AQ Sedna Filter S1000-50-AQ Sedna Filter S1000-50-AQ

    Pentair Aquatics

    Sedna Filter S1000-50-AQ

    Sedna Filter S1000-50-AQ Get top-end filter performance with low maintenance! The single-piece base/tank is constructed of fiberglass-reinforced polypropylene for improved strength and chemical resistance. Fiberglass-reinforced cartridge filter Get...

    $294.04
  • Eheim Pro 4+ 600 Canister Filter with Media Eheim Pro 4+ 600 Canister Filter with Media Eheim Pro 4+ 600 Canister Filter with Media Eheim Pro 4+ 600 Canister Filter with Media

    Eheim

    Eheim Pro 4+ 600 Canister Filter with Media

    Eheim Pro 4+ 600 Canister Filter with Mediar The EHEIM professionel 4+ – our best external filter but now with an integrated ‘emergency’ button.We have adopted the many advantages of the professional 3 series – powerful...

    $289.95
  • Red Sea Reef-Mat 250 Smart Roller Filter Red Sea Reef-Mat 250 Smart Roller Filter Red Sea Reef-Mat 250 Smart Roller Filter Red Sea Reef-Mat 250 Smart Roller Filter Red Sea Reef-Mat 250 Smart Roller Filter

    Red Sea

    Red Sea Reef-Mat 250 Smart Roller Filter

    Red Sea Reef-Mat 250 Smart Roller Filter Meet the ReefMat 250 - providing the ReefMat advantage in a compact version that fits into almost any reef system!The ReefMat 250 is a plug & play, fully automated roller filter that keeps the aquarium water...

    Was: $329.00
    Now: $289.52
  • AquaEl UltraMax 2000 Canister Filter AquaEl UltraMax 2000 Canister Filter AquaEl UltraMax 2000 Canister Filter AquaEl UltraMax 2000 Canister Filter

    AquaEl

    AquaEl UltraMax 2000 Canister Filter

    AquaEl UltraMax 2000 Canister Filter The AquaEl UltraMax 2000 Professional Canister Filter is a technologically advanced canister filter whose design is based on patented solutions that guarantee exceptional comfort of use, perfect water clarity, and...

    $288.89