Live Help Chat

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.

  • Tidal 110 Aquarium Power Filter Tidal 110 Aquarium Power Filter Tidal 110 Aquarium Power Filter Tidal 110 Aquarium Power Filter Tidal 110 Aquarium Power Filter

    Seachem

    Tidal 110 Aquarium Power Filter

    Tidal 110 Aquarium Power Filter TIDAL hang on filters are designed from the ground up to provide the aquarium with high-quality, easy to implement, comprehensive filtration. While having a system plumbed with an overflow and sump certainly has its...

    $91.34
  • Sicce SHARK PRO 900 Internal Filter - 238 gph Sicce SHARK PRO 900 Internal Filter - 238 gph Sicce SHARK PRO 900 Internal Filter - 238 gph

    Sicce

    Sicce SHARK PRO 900 Internal Filter - 238 gph

    Sicce SHARK PRO 900 Internal Filter - 238 gph Shark PRO NEW range of internal filters with a very effective and high filtration volume which guarantee a crystal clear water in your tank. The SHARK PRO filters comes with a modular and flexible design...

    $89.99
  • Eshopps Cliff Hanger 4"  Filter Sock Holder Eshopps Cliff Hanger 4"  Filter Sock Holder

    Eshopps

    Eshopps Cliff Hanger 4" Filter Sock Holder

    Eshopps Cliff Hanger 4" Filter Sock Holder The ESHOPPS Cliff Hanger 4″ and R Filter Sock holder is the most innovative way to add mechanical filtration to any sump. Cliff Hanger incorporates a 1″ (single for 4″ & dual for R) bulkhead inlet, and up...

    $89.98
  • Oase BioPlus Thermo 50 Internal Filter Oase BioPlus Thermo 50 Internal Filter Oase BioPlus Thermo 50 Internal Filter Oase BioPlus Thermo 50 Internal Filter Oase BioPlus Thermo 50 Internal Filter

    OASE

    Oase BioPlus Thermo 50 Internal Filter

    Oase BioPlus Thermo 50 Internal Filter 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 Integrated diffuser with three adjustable water...

    $84.99
  • Hagen AquaClear 110 (500) Power Filter

    Fluval

    Hagen AquaClear 110 (500) Power Filter

    Hagen AquaClear 110 (500) Power Filter **** PRODUCT MANUAL **** The Aqua Clear 110 provides biological, chemical and mechanical filtration and was designed for easy and convenient maintenance. Filter media which comes with the filter for your first time...

    MSRP: $119.99
    Was: $119.99
    Now: $83.99
  • Replacement Cartridge for Sedna Filter S1000-75-AQ Replacement Cartridge for Sedna Filter S1000-75-AQ

    Pentair Aquatics

    Replacement Cartridge for Sedna Filter S1000-75-AQ

    Replacement Cartridge for Sedna Filter S1000-75-AQ These 20 micron pleated cartridges are available in five sizes to fit the five sizes of Sedna Filters. Choose the right size filter cartridge to match your Sedna Filter. S1000-50C-AQ:...

    $83.23
  • Oase BioPlus 200 Internal Filter Oase BioPlus 200 Internal Filter Oase BioPlus 200 Internal Filter Oase BioPlus 200 Internal Filter Oase BioPlus 200 Internal Filter

    OASE

    Oase BioPlus 200 Internal Filter

    Oase BioPlus 200 Internal Filter Integrated diffuser with three adjustable water flow settings – Allows for uniform surface movement, prevents formation of biofilm, and provides added aeration Simple cleaning and maintenance – Remove individual...

    $80.99
  • Fluval C4 Power Filter Fluval C4 Power Filter Fluval C4 Power Filter

    Fluval

    Fluval C4 Power Filter

    Fluval C4 Power Filter * Customizable 5-stage filter for superior aquarium water quality * Additional filtration stages for cleaner, clearer aquarium water * Compartmentalized filter design allows quick easy...

    $79.99
  • Sicce SHARK PRO 700 Internal Filter - 185 gph Sicce SHARK PRO 700 Internal Filter - 185 gph Sicce SHARK PRO 700 Internal Filter - 185 gph

    Sicce

    Sicce SHARK PRO 700 Internal Filter - 185 gph

    Sicce SHARK PRO 700 Internal Filter - 185 gph Shark PRO NEW range of internal filters with a very effective and high filtration volume which guarantee a crystal clear water in your tank. The SHARK PRO filters comes with a modular and flexible design...

    $79.99
  • Hagen Fluval U3 Underwater Filter Hagen Fluval U3 Underwater Filter

    Fluval

    Hagen Fluval U3 Underwater Filter

    Hagen Fluval U3 Underwater Filter The Fluval “U” Internal Filters are ideal for use as a permanent filter system, for supplemental filtration, or as a "quick-filter" to polish water. The U1 offers single stage filtration, while the U2/U3/U4...

    $76.99
  • Tidal 75 Aquarium Power Filter Tidal 75 Aquarium Power Filter Tidal 75 Aquarium Power Filter Tidal 75 Aquarium Power Filter Tidal 75 Aquarium Power Filter

    Seachem

    Tidal 75 Aquarium Power Filter

    Tidal 75 Aquarium Power Filter TIDAL hang on filters are designed from the ground up to provide the aquarium with high-quality, easy to implement, comprehensive filtration. While having a system plumbed with an overflow and sump certainly has its...

    $75.76
  • Oase BioStyle 30 Hang-On Filter w/ Built-In Heater - Grey Oase BioStyle 30 Hang-On Filter w/ Built-In Heater - Grey

    OASE

    Oase BioStyle 30 Hang-On Filter w/ Built-In Heater - Grey

    Oase BioStyle Thermo 30 Hang-On Filter w/ Built-In Heater - Grey Compact, sleek power filter – Ideal for fresh or marine aquariums up to 30 gallons Multi-stage filtration – Includes two complete cartridges that each house a 45 ppi foam for mechanical...

    Was: $88.99
    Now: $75.64
  • Oase BioPlus 100 Internal Filter Oase BioPlus 100 Internal Filter Oase BioPlus 100 Internal Filter Oase BioPlus 100 Internal Filter Oase BioPlus 100 Internal Filter

    OASE

    Oase BioPlus 100 Internal Filter

    Oase BioPlus 100 Internal Filter Integrated diffuser with three adjustable water flow settings – Allows for uniform surface movement, prevents formation of biofilm, and provides added aeration Simple cleaning and maintenance – Remove individual...

    $71.99
  • Aquatop Internal Filter w/ UV 9W

    AQUATOP

    Aquatop Internal Filter w/ UV 9W

    Aquatop Internal Filter w/ UV 9W AQUATOP's IF-UV Series of Internal Filters with UV are easy to install and maintain. These innovative and flexible filters help to eliminate unsightly algae and control unwanted algae blooms with the integrated UV system...

    $69.99
  • Hagen Fluval AC70 Power Filter Hagen Fluval AC70 Power Filter Hagen Fluval AC70 Power Filter Hagen Fluval AC70 Power Filter Hagen Fluval AC70 Power Filter

    Fluval

    Hagen Fluval AC70 Power Filter

    Hagen Fluval AC70 Power Filter The AC Series takes power filtration to the next level. Built on a best-selling platform with a 40-year reputation for exceptional quality, reliability, and convenience, this series has become a standout choice that...

    $69.99
  • Sicce SHARK PRO 500 Internal Filter - 132 gph Sicce SHARK PRO 500 Internal Filter - 132 gph Sicce SHARK PRO 500 Internal Filter - 132 gph Sicce SHARK PRO 500 Internal Filter - 132 gph Sicce SHARK PRO 500 Internal Filter - 132 gph

    Sicce

    Sicce SHARK PRO 500 Internal Filter - 132 gph

    Sicce SHARK PRO 500 Internal Filter - 132 gph Shark PRO NEW range of internal filters with a very effective and high filtration volume which guarantee a crystal clear water in your tank. The SHARK PRO filters comes with a modular and flexible design...

    $69.99
  • Tunze Comline® Nanofilter 3161 Tunze Comline® Nanofilter 3161 Tunze Comline® Nanofilter 3161

    Tunze

    Tunze Comline® Nanofilter 3161

    Tunze Comline® Nanofilter 3161 for fresh and sea water depending on the tank load of 30 liters (8 USgal.) to 100 liters (26 USgal.) (filter for nano aquariums) or up to 1,000 liters (264 USgal.) (surface filter). Variable pumping power from 250...

    $69.99
  • CustomFlo Water System Complete Kit by Pentair Aquatics CustomFlo Water System Complete Kit by Pentair Aquatics

    Pentair Aquatics

    CustomFlo Water System Complete Kit by Pentair Aquatics

    Customflo Water System is a new complete system that enables the creation of any desired flow patterns in a ny size aquarium tank and with any make or filter size...Customflo Water System is a new complete system that enables the creation of any desired...

    $69.95
  • Aquatop Internal Filter w/ UV 7W Aquatop Internal Filter w/ UV 7W Aquatop Internal Filter w/ UV 7W

    AQUATOP

    Aquatop Internal Filter w/ UV 7W

    Aquatop Internal Filter w/ UV 7W AQUATOP's IF-UV Series of Internal Filters with UV are easy to install and maintain. These innovative and flexible filters help to eliminate unsightly algae and control unwanted algae blooms with the integrated UV system...

    $64.99
  • Replacement Cartridge for Sedna Filter S1000-50-AQ Replacement Cartridge for Sedna Filter S1000-50-AQ

    Pentair Aquatics

    Replacement Cartridge for Sedna Filter S1000-50-AQ

    Replacement Cartridge for Sedna Filter S1000-50-AQ These 20 micron pleated cartridges are available in five sizes to fit the five sizes of Sedna Filters. Choose the right size filter cartridge to match your Sedna Filter. S1000-50C-AQ:...

    $64.27
  • Oase BioPlus 50 Internal Filter Oase BioPlus 50 Internal Filter Oase BioPlus 50 Internal Filter Oase BioPlus 50 Internal Filter Oase BioPlus 50 Internal Filter

    OASE

    Oase BioPlus 50 Internal Filter

    Oase BioPlus 50 Internal Filter   Integrated diffuser with three adjustable water flow settings – Allows for uniform surface movement, prevents formation of biofilm, and provides added aeration Simple cleaning and maintenance – Remove individual...

    $63.99
  • Hagen AquaClear 70 (300) Power Filter

    Fluval

    Hagen AquaClear 70 (300) Power Filter

    Hagen AquaClear 70 (300) Power FilterSpecifications:* Flow: 100-300 gph* Rated for up to 40-70 gallon aquariums.* Size: 8 1/2"L X 6"W X 8"H with 3 3/4" of its width behind the tank.* Warranty: 2 Year WarrantyHagen AquaClear 70 (300) Power Filter ****...

    Was: $74.99
    Now: $63.74
  • Hagen Fluval U2 Underwater Filter Hagen Fluval U2 Underwater Filter

    Fluval

    Hagen Fluval U2 Underwater Filter

    Hagen Fluval U2 Underwater Filter The Fluval “U” Internal Filters are ideal for use as a permanent filter system, for supplemental filtration, or as a "quick-filter" to polish water. The U1 offers single stage filtration, while the U2/U3/U4...

    $60.99
  • Tidal 55 Aquarium Power Filter Tidal 55 Aquarium Power Filter Tidal 55 Aquarium Power Filter Tidal 55 Aquarium Power Filter Tidal 55 Aquarium Power Filter

    Seachem

    Tidal 55 Aquarium Power Filter

    Tidal 55 Aquarium Power Filter TIDAL hang on filters are designed from the ground up to provide the aquarium with high-quality, easy to implement, comprehensive filtration. While having a system plumbed with an overflow and sump certainly has its...

    $60.16
  •  Sicce Shark ADV 800 Internal Filter  Sicce Shark ADV 800 Internal Filter  Sicce Shark ADV 800 Internal Filter  Sicce Shark ADV 800 Internal Filter

    Sicce

    Sicce Shark ADV 800 Internal Filter

    Sicce Shark ADV 800 Internal Filter, 211 gph, 10 watts Exclusive in design, Shark ADV is one of the best internal filters for aquariums. Shark ADV comes in three versions with different powers: from 400 to 800 l/h, for 60-200 L aquariums. Shark ADV...

    $59.99
  • Fluval C3 Power Filter Fluval C3 Power Filter Fluval C3 Power Filter

    Fluval

    Fluval C3 Power Filter

    Fluval C3 Power Filter * Customizable 5-stage filter for superior aquarium water quality * Additional filtration stages for cleaner, clearer aquarium water * Compartmentalized filter design allows quick easy...

    $59.99
  • Fluval FX Gravel Vacuum Fluval FX Gravel Vacuum Fluval FX Gravel Vacuum Fluval FX Gravel Vacuum Fluval FX Gravel Vacuum

    Fluval

    Fluval FX Gravel Vacuum

    Fluval FX Gravel Vacuum The FX Gravel Vac quickly connects to all Fluval FX canister filters for the ultimate convenience in powered substrate cleaning. Key Features : Effectively traps dirt and debris Integrated filter housing with Fine and Super...

    $59.99
  • Hagen Fluval AC50 Power Filter Hagen Fluval AC50 Power Filter Hagen Fluval AC50 Power Filter Hagen Fluval AC50 Power Filter Hagen Fluval AC50 Power Filter

    Fluval

    Hagen Fluval AC50 Power Filter

    Hagen Fluval AC50 Power Filter The AC Series takes power filtration to the next level. Built on a best-selling platform with a 40-year reputation for exceptional quality, reliability, and convenience, this series has become a standout choice that...

    $59.99
  • Marine Pure VAULT Marine Pure VAULT

    Marinepure

    Marine Pure VAULT

    Marine Pure VAULT Secure container to keep your MarinePure Biofilter Media safe and helps keep sump organized and easier to keep clean. Easy to assemble and it can also be used as a protein skimmer. Stackable, you can stack them together for larger...

    $59.99
  • Oase CrystalSkim 600 Oase CrystalSkim 600

    OASE

    Oase CrystalSkim 600

    Oase CrystalSkim 600 Innovative Surface Skimming - OASE CrystalSkim 600 quickly and effectively frees the aquarium surface of the biofilm, floating plant debris, and substances For a Healthy Aquarium Environment - CrystalSkim eliminates any biofilm...

    $59.99
  • Oase BioStyle 50 Hang-On Filter - Grey Oase BioStyle 50 Hang-On Filter - Grey

    OASE

    Oase BioStyle 50 Hang-On Filter - Grey

    Oase BioStyle 50 Hang-On Filter - Grey Multi-stage filter cartridge – Disposable filter cartridge contains mechanical, biological, and chemical filtration Quick installation – Designed with an adjustable leveler, for securing the hang on filter to...

    Was: $67.99
    Now: $57.79
  • Sicce Shark MINI Surface SKIM 350 Plus Sicce Shark MINI Surface SKIM 350 Plus Sicce Shark MINI Surface SKIM 350 Plus Sicce Shark MINI Surface SKIM 350 Plus Sicce Shark MINI Surface SKIM 350 Plus

    Sicce

    Sicce Shark MINI Surface SKIM 350 Plus

    Sicce Shark MINI Surface SKIM 350 Plus Shark MINI SKIM effectively filters surface water, quickly and accurately freeing it from floating objects such as plant debris, dust and those annoying molds that can cause a reduction in the necessary air exchange...

    $52.99
  • Fluval C2 Power Filter Fluval C2 Power Filter Fluval C2 Power Filter

    Fluval

    Fluval C2 Power Filter

    Fluval C2 Power Filter * Customizable 5-stage filter for superior aquarium water quality * Additional filtration stages for cleaner, clearer aquarium water * Compartmentalized filter design allows quick easy...

    $49.99
  • Hagen Fluval AC30 Power Filter Hagen Fluval AC30 Power Filter Hagen Fluval AC30 Power Filter Hagen Fluval AC30 Power Filter Hagen Fluval AC30 Power Filter

    Fluval

    Hagen Fluval AC30 Power Filter

    Hagen Fluval AC30 Power Filter The AC Series takes power filtration to the next level. Built on a best-selling platform with a 40-year reputation for exceptional quality, reliability, and convenience, this series has become a standout choice that...

    $49.99
  • Sicce Shark ADV 600 Internal Filter Sicce Shark ADV 600 Internal Filter Sicce Shark ADV 600 Internal Filter Sicce Shark ADV 600 Internal Filter

    Sicce

    Sicce Shark ADV 600 Internal Filter

    Sicce Shark ADV 600 Internal Filter, 136 gph, 8 watts Exclusive in design, Shark ADV is one of the best internal filters for aquariums. Shark ADV comes in three versions with different powers: from 400 to 800 l/h, for 60-200 L aquariums. Shark ADV...

    $49.99
  • Oase BioStyle 30 Hang-On Filter - Grey Oase BioStyle 30 Hang-On Filter - Grey

    OASE

    Oase BioStyle 30 Hang-On Filter - Grey

    Oase BioStyle 30 Hang-On Filter - Grey Multi-stage filter cartridge – Disposable filter cartridge contains mechanical, biological, and chemical filtration Quick installation – Designed with an adjustable leveler, for securing the hang on filter to...

    Was: $57.99
    Now: $49.29
  • Tidal 35 Aquarium Power Filter Tidal 35 Aquarium Power Filter Tidal 35 Aquarium Power Filter Tidal 35 Aquarium Power Filter Tidal 35 Aquarium Power Filter

    Seachem

    Tidal 35 Aquarium Power Filter

    Tidal 35 Aquarium Power Filter TIDAL hang on filters are designed from the ground up to provide the aquarium with high-quality, easy to implement, comprehensive filtration. While having a system plumbed with an overflow and sump certainly has its...

    $48.48
  • Sicce Shark PRO NANO 320 Sicce Shark PRO NANO 320 Sicce Shark PRO NANO 320 Sicce Shark PRO NANO 320 Sicce Shark PRO NANO 320

    Sicce

    Sicce Shark PRO NANO 320

    Sicce Shark PRO NANO 320 Having adequate filters for a small size aquarium is crucial to keep the livestock healthy. With the new SHARK PRO NANO we are offering the best compact option with EXTRA flow and MAX filtration capacity for small aquariums. Two...

    $44.99
  • Stainless Steel Intake Return Pipe 18" long Stainless Steel Intake Return Pipe 18" long

    AquaCave

    Stainless Steel Intake Return Pipe 18" long

    Stainless Steel Intake Return Pipe 18" long Fits 5/8" ID Tubing Stainless steel Return Pipes offer an incredibly durable and sleek looking alternative to standard filter returns for a variety of different types of aquarium filters or pumps. They are...

    $44.95
  • Sicce Shark MINI Surface SKIM 350 Sicce Shark MINI Surface SKIM 350 Sicce Shark MINI Surface SKIM 350 Sicce Shark MINI Surface SKIM 350 Sicce Shark MINI Surface SKIM 350

    Sicce

    Sicce Shark MINI Surface SKIM 350

    Sicce Shark MINI Surface SKIM 350 Shark MINI SKIM effectively filters surface water, quickly and accurately freeing it from floating objects such as plant debris, dust and those annoying molds that can cause a reduction in the necessary air exchange...

    $42.99
  • Fluval FX Spray Bar Kit Fluval FX Spray Bar Kit Fluval FX Spray Bar Kit Fluval FX Spray Bar Kit Fluval FX Spray Bar Kit

    Fluval

    Fluval FX Spray Bar Kit

    Fluval FX Spray Bar Kit DESCRIPTION The Fluval FX Spray Bar is used to direct water to any area of the aquarium. By doing so, increases surface agitation and improves oxygenation which is essential for a healthy aquarium. Features: Specifically...

    $39.99
  • Hagen Fluval AC20 Power Filter Hagen Fluval AC20 Power Filter Hagen Fluval AC20 Power Filter Hagen Fluval AC20 Power Filter Hagen Fluval AC20 Power Filter

    Fluval

    Hagen Fluval AC20 Power Filter

    Hagen Fluval AC20 Power Filter The AC Series takes power filtration to the next level. Built on a best-selling platform with a 40-year reputation for exceptional quality, reliability, and convenience, this series has become a standout choice that...

    $39.99
  • Sicce Shark ADV 400 Internal Filter Sicce Shark ADV 400 Internal Filter Sicce Shark ADV 400 Internal Filter Sicce Shark ADV 400 Internal Filter

    Sicce

    Sicce Shark ADV 400 Internal Filter

    Sicce Shark ADV 400 Internal Filter 106gph The SHARK ADV is an exclusively designed internal filter with a patented magnetic quick uncoupling system (MCS System). The modular design allows the possibility of adding one or more filtering compartments to...

    $39.99
  • Eshopps Rectangular Bags, 3 pack Eshopps Rectangular Bags, 3 pack Eshopps Rectangular Bags, 3 pack

    Eshopps

    Eshopps Rectangular Bags, 3 pack

    Eshopps Rectangular Bags, 3 pack Dimensions (approx.): 7" x 4.5" x 12"Eshopps Rectangular Bags, 3 pack Dimensions (approx.): 7" x 4.5" x 12"Product code: 5629Item No. FT-ES-29871

    $39.98
  • Stainless Steel Intake Return Pipe Kit 14" long Stainless Steel Intake Return Pipe Kit 14" long

    AquaCave

    Stainless Steel Intake Return Pipe Kit 14" long

    Stainless Steel Intake Return Pipe 14" long Fits 1/2" ID Tubing Stainless steel Return Pipes offer an incredibly durable and sleek looking alternative to standard filter returns for a variety of different types of aquarium filters or pumps. They are...

    $39.95
  • Oase BioStyle 20 Hang-On Filter - Grey Oase BioStyle 20 Hang-On Filter - Grey

    OASE

    Oase BioStyle 20 Hang-On Filter - Grey

    Oase BioStyle 20 Hang-On Filter - Grey Multi-stage filter cartridge – Disposable filter cartridge contains mechanical, biological, and chemical filtration Quick installation – Designed with an adjustable leveler, for securing the hang-on filter to...

    Was: $41.99
    Now: $35.69
  • Hagen AquaClear 30 (150) Power Filter

    Fluval

    Hagen AquaClear 30 (150) Power Filter

    Hagen AquaClear 30 (150) Power FilterThe Aqua Clear 30 provides biological, chemical and mechanical filtration and was designed for easy and convenient maintenance. Filter media which comes with the filter for your first time use, replaces easily in a...

    MSRP: $49.99
    Was: $49.99
    Now: $34.99