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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.

  • Hydro Sponge 2 PRO Aquarium Filter Hydro Sponge 2 PRO Aquarium Filter

    Aquarium Technology

    Hydro Sponge 2 PRO Aquarium Filter

    Hydro Sponge 2 PRO Aquarium Filter The Hydro-Sponge Pro is the newest product line among our family. The Hydro-Sponge Pro like the Hydro-Sponge is made in all the same sizes but unlike the Hydro-Sponge line it uses reticulated foam. This gives the...

    $17.99
  • Hydro Sponge 5 Aquarium Filter Hydro Sponge 5 Aquarium Filter

    Aquarium Technology

    Hydro Sponge 5 Aquarium Filter

    Hydro Sponge 5 Aquarium Filter The Hydro Sponge filters provides both mechanical and biological filtration. Aerobic bacteria colonize the sponge, providing a bacterial substrate to facilitate the nitrogen cycle. In addition, the Hydro-Sponge traps...

    $17.99
  • Sicce MEGA FILTRA Replacement Hypercarbo Fast (2units) Sicce MEGA FILTRA Replacement Hypercarbo Fast (2units)

    Sicce

    Sicce MEGA FILTRA Replacement Hypercarbo Fast (2units)

    Sicce MEGA FILTRA Replacement Hypercarbo Fast (2units) Replacement Filter Media for Sicce Mega Filtra Canister Filters Keep your Mega Filtra canister filter running at peak performance with replacement media. Compatible with: Mega Filtra 650 Canister...

    $17.99
  • Red Sea Reefer Filter Media Cup 4" Red Sea Reefer Filter Media Cup 4"

    Red Sea

    Red Sea Reefer Filter Media Cup 4"

    Red Sea Reefer Filter Media Cup 4" 4" filter media cups include a free high quality filter media bag, as used in Red Sea Reef-Spec Carbon. Cup Dimensions: 4.25 x 4.25 x 8.5" Red Sea Reefer Filter Media Cup 4" 4" filter media cups include a free...

    $17.95
  • ReefMat Sump Modification Kit ReefMat Sump Modification Kit

    Red Sea

    ReefMat Sump Modification Kit

    ReefMat Sump Modification Kit This kit was designed to be an effective tool for removing the internals of sumps, and for cutting and removing silicon & glass panels to enable the installation of the Red Sea ReefMat filter.Kit Includes: 1x -...

    $17.00
  • Eheim 2213 filter Sealing O-Ring Eheim 2213 filter Sealing O-Ring

    Eheim

    Eheim 2213 filter Sealing O-Ring

    Eheim 2213 filter Sealing O-Ring Main Rubber Seal Ring, prevents leaks by making a water tight seal in-between the main motor head, and the filter body. Check the condition of the main seal ring every time you do filter maintenance; pro-actively replace...

    $16.99
  • Eheim 2215 filter Sealing O-Ring Eheim 2215 filter Sealing O-Ring

    Eheim

    Eheim 2215 filter Sealing O-Ring

    Eheim 2215 filter Sealing O-Ring Prevents leaks by making a water tight seal in-between the main motor head and the filter body. Monitor the condition of the main seal ring every time you do filter maintenance and be sure to pro-actively replace it to...

    $16.99
  • Eheim 2217 filter Sealing O-Ring Eheim 2217 filter Sealing O-Ring

    Eheim

    Eheim 2217 filter Sealing O-Ring

    Eheim 2217 filter Sealing O-Ring Main Rubber Seal Ring, prevents leaks by making a water tight seal in-between the main motor head, and the filter body. Check the condition of the main seal ring every time you do filter maintenance; pro-actively replace...

    $16.99
  • Hydro Sponge 3 Aquarium Filter Hydro Sponge 3 Aquarium Filter

    Aquarium Technology

    Hydro Sponge 3 Aquarium Filter

    Hydro Sponge 3 Aquarium Filter The Hydro Sponge filters provides both mechanical and biological filtration. Aerobic bacteria colonize the sponge, providing a bacterial substrate to facilitate the nitrogen cycle. In addition, the Hydro-Sponge traps...

    $16.99
  • Hydro Sponge 4 Aquarium Filter Hydro Sponge 4 Aquarium Filter

    Aquarium Technology

    Hydro Sponge 4 Aquarium Filter

    Hydro Sponge 4 Aquarium Filter The Hydro Sponge filters provides both mechanical and biological filtration. Aerobic bacteria colonize the sponge, providing a bacterial substrate to facilitate the nitrogen cycle. In addition, the Hydro-Sponge traps...

    $16.99
  • Fluval Biomax, 500 gr. by Hagen

    Fluval

    Fluval Biomax, 500 gr. by Hagen

    BioMax filter media are inert ceramic rings that are capable of supporting large populations of water purifying bacteria. Composed of a variety of channels and tunnels, the multitude of tiny pores can support these colonies of beneficial bacteria. BioMax...

    $16.95
  • Hydro Sponge 1 Aquarium Filter Hydro Sponge 1 Aquarium Filter

    Aquarium Technology

    Hydro Sponge 1 Aquarium Filter

    Hydro Sponge 1 Aquarium Filter The Hydro Sponge filters provides both mechanical and biological filtration. Aerobic bacteria colonize the sponge, providing a bacterial substrate to facilitate the nitrogen cycle. In addition, the Hydro-Sponge traps...

    $15.99
  • Hydro Sponge 2 Aquarium Filter Hydro Sponge 2 Aquarium Filter

    Aquarium Technology

    Hydro Sponge 2 Aquarium Filter

    Hydro Sponge 2 Aquarium Filter The Hydro Sponge filters provides both mechanical and biological filtration. Aerobic bacteria colonize the sponge, providing a bacterial substrate to facilitate the nitrogen cycle. In addition, the Hydro-Sponge traps...

    $15.99
  • Simplicity 4" Filter Sock Holder - Black Simplicity 4" Filter Sock Holder - Black

    Simplicity

    Simplicity 4" Filter Sock Holder - Black

    Simplicity 4" Filter Sock Holder - Black Great solution when using a glass aquarium as a sump. Compatible with most brands of filter socks. Available in 4-inch and 7-inch sizes. Perfect, inexpensive option for use with do-it-yourself sumps...

    $15.95
  • Bubble Magus 4" Media Cup Bubble Magus 4" Media Cup

    Bubble Magus

    Bubble Magus 4" Media Cup

    Bubble Magus 4" Media Cup Rigid acrylic filter cup made to fit a regular 4" sock holder, this version has additional vertical flow slots in the sides,  these slots in addition to the base venting create an effective open area of 99% across the diameter...

    $14.99
  • Fluval Zeo-Carb, 150 gr. 3 Pack Fluval Zeo-Carb, 150 gr. 3 Pack

    Fluval

    Fluval Zeo-Carb, 150 gr. 3 Pack

    Fluval Zeo-Carb, 150 gr. 3 Pack Features Chemical filter media Frees up space inside the filter to include additional media if desired Helps create clean and healthy water conditions Mesh bag included for use in sumps and large filters

    $14.99
  • Eshopps Rectangle Micron Bag Eshopps Rectangle Micron Bag

    Eshopps

    Eshopps Rectangle Micron Bag

    Eshopps Rectangle Micron Bag. Dimensions (approx.): 7" x 4.5" x 12"Eshopps Rectangle Micron Bag. Dimensions (approx.): 7" x 4.5" x 12"Product code: 2528Item No. FT-ES-PF-BAG

    $14.98
  • Fluval Pre-Filter Media750 gr.

    Fluval

    Fluval Pre-Filter Media750 gr.

    Fluval Pre-Filter consists of inert, solid ceramic rings used to trap large and medium solid particles before they clog the finer sieves of the media baskets above...Fluval Pre-Filter consists of inert, solid ceramic rings used to trap large and medium...

    $14.95
  • Sicce MEGA FILTRA Replacement Hyperzeo (2units) Sicce MEGA FILTRA Replacement Hyperzeo (2units)

    Sicce

    Sicce MEGA FILTRA Replacement Hyperzeo (2units)

    Sicce MEGA FILTRA Replacement Hyperzeo (2units) Replacement Filter Media for Sicce Mega Filtra Canister Filters Keep your Mega Filtra canister filter running at peak performance with replacement media. Compatible with: Mega Filtra 650 Canister...

    $13.99
  • AquaClear 110 (500) Foam Cartridge 1/pack by Hagen

    Fluval

    AquaClear 110 (500) Foam Cartridge 1/pack by Hagen

    AquaClear 110 (500) Replacement Foam Cartridges 1/pack by Hagen. AquaClear Foam Filter Inserts provide mechanical filtration by trapping particles and debris in addition to providing biological filtration. Exclusively designed for the AquaClear Power...

    $12.99
  • Eshopps Blue 1" PVC Pipe Plumbing Kit Eshopps Blue 1" PVC Pipe Plumbing Kit

    Eshopps

    Eshopps Blue 1" PVC Pipe Plumbing Kit

    Eshopps Blue Pro Plumbing Kit Vibrant, polished plumbing with no markings, lettering or stamping.Solid coloring, no light spills, eliminating algae growth.Easy assembly and disassembly with unions for maintenance or expansion.Rigid, strong construction...

    $12.99
  • Eshopps Red 1" PVC Pipe Plumbing Kit Eshopps Red 1" PVC Pipe Plumbing Kit

    Eshopps

    Eshopps Red 1" PVC Pipe Plumbing Kit

    Eshopps Red Pro Plumbing Kit Vibrant, polished plumbing with no markings, lettering or stamping.Solid coloring, no light spills, eliminating algae growth.Easy assembly and disassembly with unions for maintenance or expansion.Rigid, strong construction...

    $12.99
  • Eshopps Red/Blue 1" PVC Pipe Plumbing Kit Eshopps Red/Blue 1" PVC Pipe Plumbing Kit

    Eshopps

    Eshopps Red/Blue 1" PVC Pipe Plumbing Kit

    Eshopps Combo Pro Plumbing Kit Vibrant, polished plumbing with no markings, lettering or stamping.Solid coloring, no light spills, eliminating algae growth.Easy assembly and disassembly with unions for maintenance or expansion.Rigid, strong construction...

    $12.99
  • Fluval 206/207 Bio-Foam Value Pack Fluval 206/207 Bio-Foam Value Pack Fluval 206/207 Bio-Foam Value Pack Fluval 206/207 Bio-Foam Value Pack Fluval 206/207 Bio-Foam Value Pack

    Fluval

    Fluval 206/207 Bio-Foam Value Pack

    Fluval 206/207 Bio-Foam Value Pack   Fluval’s all-new media value packs are specifically designed for use with 06 and 07 series performance canister filters. Featuring all the quality, effectiveness and convenience you’ve come to expect...

    $12.99
  • Fluval 306/307 Bio-Foam Value Pack Fluval 306/307 Bio-Foam Value Pack Fluval 306/307 Bio-Foam Value Pack Fluval 306/307 Bio-Foam Value Pack Fluval 306/307 Bio-Foam Value Pack

    Fluval

    Fluval 306/307 Bio-Foam Value Pack

    Fluval 306/307 Bio-Foam Value Pack   Fluval’s all-new media value packs are specifically designed for use with 06 and 07 series performance canister filters. Featuring all the quality, effectiveness and convenience you’ve come to expect...

    $12.99
  • Fluval 406/407 Bio-Foam Value Pack Fluval 406/407 Bio-Foam Value Pack Fluval 406/407 Bio-Foam Value Pack Fluval 406/407 Bio-Foam Value Pack Fluval 406/407 Bio-Foam Value Pack

    Fluval

    Fluval 406/407 Bio-Foam Value Pack

    Fluval 406/407 Bio-Foam Value Pack   Fluval’s all-new media value packs are specifically designed for use with 06 and 07 series performance canister filters. Featuring all the quality, effectiveness and convenience you’ve come to expect...

    $12.99
  • Prefilter Foam Square, Large Prefilter Foam Square, Large

    Eshopps

    Prefilter Foam Square, Large

    Prefilter Foam Square, LargeDimensions: 13 1/4" x 3 7/8" x 2 1/8"Prefilter Foam Square, LargeDimensions: 13 1/4" x 3 7/8" x 2 1/8"Product code: 1790Item No. FT-ES-19070

    $12.99
  • Sponge Filter, Dual Sponge Filter, Dual Sponge Filter, Dual Sponge Filter, Dual

    AquaCave

    Sponge Filter, Dual

    Sponge Filter, Dual Super Biochemical Spoge Filter Size: Each Sponge Disc W 2" 1/4"  H 3/4" Size: Unit W 6" 1/2" W 9" 1/2"    

    $12.99
  • Fluval Ammonia Remover 540g. / 3x 180 gr. Fluval Ammonia Remover 540g. / 3x 180 gr.

    Fluval

    Fluval Ammonia Remover 540g. / 3 x 180 gr.

    Fluval Ammonia Remover 540g. / 3x 180 gr. Features Chemical filter media Controlling ammonia levels creates a safe environment and reduces stress on fish Particularly useful when setting up a new aquarium or for those with heavy fish stock Mesh bag...

    $12.95
  • Filter Max 3 Prefilter Filter Max 3 Prefilter

    Aquarium Technology

    Filter Max 3 Prefilter

    Filter Max 3 Prefilter The Filter Max Prefilters provide filtration of water before entering the main filter. They prevent debris from clogging the filter media and at the same time provide biological filtration. These prefilters Can be used with most...

    $11.99
  • Media Maintenance Kit for Fluval AC70 Power Filter Media Maintenance Kit for Fluval AC70 Power Filter Media Maintenance Kit for Fluval AC70 Power Filter

    Fluval

    Media Maintenance Kit for Fluval AC70 Power Filter

    Media Maintenance Kit for Fluval AC70 Power Filter   The Media Maintenance Kit contains a trio of Fluval’s most effective and essential filter media inserts. Features Includes Mechanical (Bio-Foam), Biological (BIOMAX), and Chemical...

    $11.99
  • 7" x 16" Micron Felt Bag

    7" x 16" Micron Felt Bag

    7" x 16" Micron Felt BagThe media bags we carry are a combination of felt material and polyester mesh material sewn together.7" x 16" Micron Felt BagThe media bags we carry are a combination of felt material and polyester mesh material sewn together...

    $11.95
  • Filter Sock Holder 7" by CPR Aquatics

    CPR

    Filter Sock Holder 7" by CPR Aquatics

    * Simple ways to add mechanical filtration to any situation - Skimmer outlets, overflow or filter outlets * Easily clarify water and remove particulate matter * Useful equipment for maintenance & service accounts - Speed up service time; make...

    $11.95
  • Red Sea 225 micron Felt filter bag - 4" x 10.5"

    Red Sea

    Red Sea 225 micron Felt filter bag - 4" x 10.5"

    Red Sea 225 micron Felt filter bag A range of 3 high quality, reusable aquarium filter bags providing different levels of mechanical filtration. These 10.5″/26cm long filter bags for Red Sea’s REEFER and MAX-S aquariums...

    $11.95
  • Corner Box Filter, Large Corner Box Filter, Large Corner Box Filter, Large Corner Box Filter, Large Corner Box Filter, Large

    AquaCave

    Corner Box Filter, Large

    Corner Box Filter, Large Dimensions: Width: 3.1" Height: 6" Multi-layer Fine Sponge: Provide mechanical and biological filtration and trap debris or wastes without sucking up your fish. Keep fish tanks crystal clear and healthy. Further Cleaning: The...

    $10.99
  • Pre-filter Foam Round, Large

    Eshopps

    Pre-filter Foam Round, Large

    Pre-filter Foam Round, Large Dimensions: 7" Long x 3" dia. 1" hole dia. Pre-filter Foam Round, Large Dimensions: 7" Long x 3" dia. 1" hole dia. Product code: 1789Item No. FT-ES-19055

    $10.99