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Chemical Filtration: Reactors
We also carry all the Two Little Fishies Phosban Reactor and KW Reactor replacements parts.

Visit the Filtration Overview Page for recommended equipment for reef, saltwater fish only and freshwater tanks, and for some basic aquarium filtration theory.
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Two Little Fishies PhosBan Reactor 150 two little fishes phosphate reactor 150
Two Little Fishies PhosBan Reactor 150
In Stock
Our Price: $40.99
In Stock

The Two Little Fishies PhosBan Reactor 150 is designed with the upflow principle to achieve the most efficient use of PhosBan or other chemical filter media. By pushing water from the bottom upward through a dispersion plate, it forces an even distribution of water through the media, and prevents channeling. It can be mounted hanging on the back of the aquarium or below the aquarium.
  • PhosBan Reactor 150 user manual (pdf file in new window)
  • For aquariums up to 150 gallons
  • Hose barb connections are for 1/2 inch i.d. tubing
  • Includes 1/2 inch barbed ball valve for flow control, and hose clamps
  • Recommended flow rate is 20 to 30 gallons per hour (pump is not included)
  • Use with a maximum of 200 grams PhosBan (or media height of 5 inches (13 cm.) or use with NPX Bioplastics
Two Little Fishies PhosBan Reactor 550 two little fishes phosphate reactor 550
Two Little Fishies PhosBan Reactor 550
In Stock
Our Price: $65.79
In Stock

The Two Little Fishies PhosBan Reactor 550 is designed with the upflow principle to achieve the most efficient use of PhosBan or other chemical filter media. By pushing water from the bottom upward through a dispersion plate, it forces an even distribution of water through the media, and prevents channeling. It can be mounted hanging on the back of the aquarium or below the aquarium.
  • For aquariums up to 600 gallons
  • Hose barb connections are for 1/2 inch i.d. tubing
  • Includes 1/2 inch barbed ball valve for flow control, and hose clamps
  • Recommended flow rate is 20 to 40 gallons per hour (pump is not included)
  • Use with a maximum of 750 grams PhosBan (or media height of ca. 8 inches (20 cm) or use with NPX Bioplastics
CPR Aquatic Mini Tumbler Media Reactor
CPR Aquatic Mini Tumbler Media Reactor
In Stock
Our Price: $50.00
In Stock

The CPR Aquatic Mini Tumbler Media Reactor makes adding chemical filtration media to saltwater and freshwater aquariums easy and more effective than currently used methods. Using an upflow design helps ensure the most efficient use of chemical filtration media. The Mini Tumbler will make it easier to keep your tank clean and healthy.

The Mini Tumbler is designed to be used with coarse media, such as the Two Little Fishies NPX Bioplastics. If you want to use a finer media such as GFO, Purigen or ion-based media please purchase the Tumbler Fine Media Kit (not yet available).

Includes:
  • Mini Reactor body (7.5" X 4.5" X 3.25", measurement does not include the pump)
  • 2 media screens & cap
  • Sliding lid
  • Circulation pump
  • Suction cups
  • Can be installed inside an aquarium or sump
CPR Aquatic Nano Tumbler Media Reactor
CPR Aquatic Nano Tumbler Media Reactor
In Stock
Our Price: $45.00
In Stock

The CPR Aquatic Nano Tumbler Media Reactor makes adding chemical filtration media to saltwater and freshwater aquariums easy and more effective than currently used methods. Using an upflow design helps ensure the most efficient use of chemical filtration media. The Nano Tumbler will make it easier to keep your tank clean and healthy.

The Nano Tumbler is designed to be used with coarse media, such as the Two Little Fishies NPX Bioplastics. If you want to use a finer media such as GFO, Purigen or ion-based media please purchase the Tumbler Fine Media Kit (not yet available).

Includes:
  • Mini Reactor body (8.25" height X 3.45" width X 3.3"). The pump will add 2.5" to the height & .75" to the width.
  • 2 media screens & cap
  • Sliding lid
  • Circulation pump
  • Suction cups
  • Designed for installation in the back compartment of a nano tank
CPR Aquatic Fine Media Kit for Nano Tumbler Media Reactor
CPR Aquatic Fine Media Kit for Nano Tumbler Media Reactor
In Stock
Our Price: $5.49
In Stock

CPR Aquatic Fine Replacement Media Kit for the Nano Tumbler Media Reactor
CPR Aquatic Fine Media Kit for Mini Tumbler Media Reactor
CPR Aquatic Fine Media Kit for Mini Tumbler Media Reactor
In Stock
Our Price: $5.89
In Stock

CPR Aquatic Fine Replacement Media Kit for the Mini Tumbler Media Reactor
Media Chamber 4-12
Bashsea Media Chamber 4-12
In Stock
Our Price: $69.99
In Stock

The Bashsea Media Chamber 4-12 extra large design allows for high media volumes, while producing an even flow to maximize water-media contact time.

  • 13" Tall. Chamber: 11-1/2" X 4".
  • For tanks up to 120 gallons
  • Does not come with a pump. The recommended flow rate for the submersible pump is 150 to 300 gph.
  • For use with all media types
  • Full access reaction chamber
  • Water distribution plate eliminates channeling of media
  • Precision water jet cut sponges
  • Precision CNC key hole flanges
  • True O-Ring Seals
  • 1/2" hose barb connections
  • Designed and hand built in the U.S.A. using 100% American made acrylic construction
Media Chamber 4-18
Bashsea Media Chamber 4-18
In Stock
Our Price: $89.99
In Stock

The Bashsea Media Chamber 4-18 extra large design allows for high media volumes, while producing an even flow to maximize water-media contact time.

  • 19-1/4" Tall. Chamber: 17-1/2" X 4".
  • For tanks up to 180 gallons
  • Does not come with a pump. The recommended flow rate for the submersible pump is 150 to 300 gph.
  • For use with all media types
  • Full access reaction chamber
  • Water distribution plate eliminates channeling of media
  • Precision water jet cut sponges
  • Precision CNC key hole flanges
  • True O-Ring Seals
  • 1/2" hose barb connections
  • Designed and hand built in the U.S.A. using 100% American made acrylic construction
Media Chamber 6-12
Bashsea Media Chamber 6-12
In Stock
Our Price: $109.99
In Stock

The Bashsea Media Chamber 6-12 extra large design allows for high media volumes, while producing an even flow to maximize water-media contact time.

  • 13" Tall. Chamber: 11-1/2" X 6".
  • For tanks up to 240 gallons
  • Does not come with a pump. The recommended flow rate for the submersible pump is 200 to 400 gph.
  • For use with all media types
  • Full access reaction chamber
  • Water distribution plate eliminates channeling of media
  • Precision water jet cut sponges
  • Precision CNC key hole flanges
  • True O-Ring Seals
  • 1/2" hose barb connections
  • Designed and hand built in the U.S.A. using 100% American made acrylic construction
Media Chamber 6-18
Bashsea Media Chamber 6-18
Out of Stock
Our Price: $149.99
(Out of Stock)

The Bashsea Media Chamber 6-18 extra large design allows for high media volumes, while producing an even flow to maximize water-media contact time.

  • 19-1/4" Tall. Chamber: 17-1/2" X 4".
  • For tanks up to 400 gallons
  • Does not come with a pump. The recommended flow rate for the submersible pump is 200 to 500 gph.
  • For use with all media types
  • Full access reaction chamber
  • Water distribution plate eliminates channeling of media
  • Precision water jet cut sponges
  • Precision CNC key hole flanges
  • True O-Ring Seals
  • 1/2" hose barb connections
  • Designed and hand built in the U.S.A. using 100% American made acrylic construction
Two Little Fishies NPX Bioplastics 200ml
Two Little Fishies NPX Bioplastics, 200ml
In Stock
Our Price: $8.99
In Stock

The Two Little Fishies NPX BioPlastics are pelletized biodegradable polymers that provide a time-released source of food for bacteria that assimilate nitrate and phosphate. As bacteria develop on the pellet surfaces, excess growth sloughs off due to the tumbling in a fluidized filter, and these bacteria can be removed with a protein skimmer or serve as planktonic food for filter-feeding invertebrates such as corals, clams, and sponges. Anaerobic zones also develop within the pellets, thus promoting denitrification there.

Features:
  • 200 ml
  • For use in a fluidized reactor, such as the Two Little Fishies Phosban Reactor. When you used with the Phosban Reactor you will need the Phosban Reactor NPX Screen. Use 100 ml per 25 gallons.
  • Can also be used in a media bag within any filter. Use 100 ml per 25 gallons. Because Bioplastics are slowly consumed, more pellets have to be added periodically.
  • These bacteria can be harvested by protein skimmers, so that the nitrate and phosphate levels are naturally reduced. The bacteria are also a food source for filter-feeding invertebrates such as corals, clams, sponges, and feather dusters.
  • Caution: Maintain sufficient water flow through NPX Bioplastics to prevent production of hydrogen sulfide gas. Employ strong water circulation, aeration, and/or a surface skimming overflow in the aquarium to maintain high levels of oxygen saturation. The use of NPX Bioplastics in marine aquariums must be accompanied by the use of a protein skimmer to achieve the export of bacteria and assimilated nutrients. It is not necessary for the outlet of the filter containing pellets to be positioned near the intake of a protein skimmer, but it is necessary to have a protein skimmer running on the system.
Two Little Fishies NPX Bioplastics 400ml
Two Little Fishies NPX Bioplastics, 400ml
In Stock
Our Price: $16.99
In Stock

The Two Little Fishies NPX BioPlastics are pelletized biodegradable polymers that provide a time-released source of food for bacteria that assimilate nitrate and phosphate. As bacteria develop on the pellet surfaces, excess growth sloughs off due to the tumbling in a fluidized filter, and these bacteria can be removed with a protein skimmer or serve as planktonic food for filter-feeding invertebrates such as corals, clams, and sponges. Anaerobic zones also develop within the pellets, thus promoting denitrification there.

Features:
  • 400 ml
  • For use in a fluidized reactor, such as the Two Little Fishies Phosban Reactor. When you used with the Phosban Reactor you will need the Phosban Reactor NPX Screen. Use 100 ml per 25 gallons.
  • Can also be used in a media bag within any filter. Use 100 ml per 25 gallons. Because Bioplastics are slowly consumed, more pellets have to be added periodically.
  • These bacteria can be harvested by protein skimmers, so that the nitrate and phosphate levels are naturally reduced. The bacteria are also a food source for filter-feeding invertebrates such as corals, clams, sponges, and feather dusters.
  • Caution: Maintain sufficient water flow through NPX Bioplastics to prevent production of hydrogen sulfide gas. Employ strong water circulation, aeration, and/or a surface skimming overflow in the aquarium to maintain high levels of oxygen saturation. The use of NPX Bioplastics in marine aquariums must be accompanied by the use of a protein skimmer to achieve the export of bacteria and assimilated nutrients. It is not necessary for the outlet of the filter containing pellets to be positioned near the intake of a protein skimmer, but it is necessary to have a protein skimmer running on the system.
Two Little Fishies NPX Bioplastics 1L
Two Little Fishies NPX Bioplastics, 1L
In Stock
Our Price: $38.49
In Stock

The Two Little Fishies NPX BioPlastics are pelletized biodegradable polymers that provide a time-released source of food for bacteria that assimilate nitrate and phosphate. As bacteria develop on the pellet surfaces, excess growth sloughs off due to the tumbling in a fluidized filter, and these bacteria can be removed with a protein skimmer or serve as planktonic food for filter-feeding invertebrates such as corals, clams, and sponges. Anaerobic zones also develop within the pellets, thus promoting denitrification there.

Features:
  • 1 L
  • For use in a fluidized reactor, such as the Two Little Fishies Phosban Reactor. When you used with the Phosban Reactor you will need the Phosban Reactor NPX Screen. Use 100 ml per 25 gallons.
  • Can also be used in a media bag within any filter. Use 100 ml per 25 gallons. Because Bioplastics are slowly consumed, more pellets have to be added periodically.
  • These bacteria can be harvested by protein skimmers, so that the nitrate and phosphate levels are naturally reduced. The bacteria are also a food source for filter-feeding invertebrates such as corals, clams, sponges, and feather dusters.
  • Caution: Maintain sufficient water flow through NPX Bioplastics to prevent production of hydrogen sulfide gas. Employ strong water circulation, aeration, and/or a surface skimming overflow in the aquarium to maintain high levels of oxygen saturation. The use of NPX Bioplastics in marine aquariums must be accompanied by the use of a protein skimmer to achieve the export of bacteria and assimilated nutrients. It is not necessary for the outlet of the filter containing pellets to be positioned near the intake of a protein skimmer, but it is necessary to have a protein skimmer running on the system.
Two Little Fishies Phosban Reactor NPX Screen 2-Pack
Two Little Fishies Phosban Reactor NPX Screen, 2-Pack
In Stock
Our Price: $1.99
In Stock

The Two Little Fishies Phosban Reactor NPX Screen prevents NPX Bioplastics or other biodegradable pelletized media from passing through the dispersion plates in the PhosBan Reator 150 or PhosBan Reactor 550.
Two Little Fishies PhosBan Reactor Extension Kit
Two Little Fishies PhosBan Reactor (150) Extension Kit
In Stock
Our Price: $3.69
In Stock

The Two Little Fishies PhosBan Reactor (150) Extension Kit can be used with the Two Little Fishies Phosban Reactor for a clean installation on the back of an aquarium (using the ball valve and clamp that come with the Phosban Reactor 150). The Phosban Reactor 550 comes stock with extension parts.
ViaAqua Poly-Reactor Multi-Media Reactor
ViaAqua Poly-Reactor Multi-Media Reactor
In Stock
Our Price: $41.50
In Stock

The ViaAqua Poly Reactor is built with high quality acrylic and an easy to remove lid with a recessed o-ring. The reverse water flow eliminates water channeling through the filter media thus efficiently utilizing filtering media. The Poly Reactor comes ready to use with a pump and all necessary plumbing parts. It's designed to be installed either in-sump or hanging on the tank. This versatile filter can be used for a number of different applications: phosphate, resins, phosphate sponge, activated carbon, nitrate sponge and other resin filtering medias.
  • 15" X 5"
  • Includes reaction chamber, down tube, intake tubing, sediment discharge filter, two barbed fittings, two lock nuts, lid, o-ring, two media strainers, two media sponges, hanger, a suction cup bracket, control valve, pump and tubing