Live Help Chat

At AquaCave, we offer some of the best selection and best prices on Calcium Reactors and accessories for you marine and reef aquarium.
Calcium reactor dose a 24 hour stream of calcium ions and carbonate ions into your reef system. This is the ideal ion pairing that the popular two-part liquid additives offer, though at a much higher long-term cost, and it is up to you to dose it daily and dose it correctly. Kalkwasser reactor is a simple and reliable way to add kalkwasser to your aquarium. Kalkwasser is an excellent source of calcium, hydroxide ions to buffer alkalinity, an unmatched ability to encourage coralline algae growth, and it precipitates phosphates out of your system water.

36 of 36 Items
  • Reef Octopus SRO 5000-D Calcium Reactor Reef Octopus SRO 5000-D Calcium Reactor

    Reef Octopus

    Reef Octopus SRO 5000-D Calcium Reactor

    Super Reef Octopus SRO 5000-D Dual Calcium Reactor. Rated for Aquariums up to 1000 Gallons Footprint: 18″ x 15.5″ | Body Diameter: 2x 8″ | Height: 23″ Recirculation Pump: Water Blaster 5000 Extra large chamber volumes,...

    $923.99
  • Reef Octopus VarioS CR220 DC Calcium Reactor      Reef Octopus VarioS CR220 DC Calcium Reactor      Reef Octopus VarioS CR220 DC Calcium Reactor      Reef Octopus VarioS CR220 DC Calcium Reactor      Reef Octopus VarioS CR220 DC Calcium Reactor

    Reef Octopus

    Reef Octopus VarioS CR220 DC Calcium Reactor

    Reef Octopus VarioS CR220 9-inch Calcium Reactor The VarioS CR is perfectly capable of meeting the challenging task of maintaining alkalinity, calcium, and trace elements on a demanding reef system. Quality, design, and controllability define the Reef...

    $820.04
  • Reef Octopus SRO 3000-D Calcium Reactor  Reef Octopus SRO 3000-D Calcium Reactor

    Reef Octopus

    Reef Octopus SRO 3000-D Calcium Reactor

    Super Reef Octopus 3000-D Calcium Reactor Rated for Aquariums up to 400 Gallons Footprint: 15.8” x 13.4” | Body Diameter: 2x 8″ | Height: 23″ Recirculation Pump: Water Blaster 3000 Extra large chamber volumes,...

    $762.29
  • Reef Octopus VarioS CR200 DC Calcium Reactor Reef Octopus VarioS CR200 DC Calcium Reactor Reef Octopus VarioS CR200 DC Calcium Reactor Reef Octopus VarioS CR200 DC Calcium Reactor Reef Octopus VarioS CR200 DC Calcium Reactor

    Reef Octopus

    Reef Octopus VarioS CR200 DC Calcium Reactor

    Reef Octopus VarioS CR200 DC Calcium Reactor,  8" dia. up to 500 gal. Footprint: 15.2″ x 10.6″ | Body Diameter: 8″ | Height: 23″  Recirculation Pump: Reef Octopus VarioS 4   CALCIUM/ALKALINITY DEMAND HEAVY - 200 gal. MEDIUM - 300 gal...

    $729.99
  • Tunze Comline 3172 Calcium Automat 3172.000 Tunze Comline 3172 Calcium Automat 3172.000 Tunze Comline 3172 Calcium Automat 3172.000 Tunze Comline 3172 Calcium Automat 3172.000

    Tunze

    Tunze Comline 3172 Calcium Automat 3172.000

    Tunze Comline 3172 Calcium Automat 3172.000 In 1989, TUNZE® Aquarientechnik was the first manufacturer to develop a CO2-controlled calcium reactor. A circulation pump is used to pass the water enriched with carbon dioxide through the hardness...

    $704.99
  • Reef Octopus KS250 Kalkwasser Stirrer Reef Octopus KS250 Kalkwasser Stirrer Reef Octopus KS250 Kalkwasser Stirrer

    Reef Octopus

    Reef Octopus KS250 Kalkwasser Stirrer

    Gently mixes your calcium hydroxide Reef Octopus Kalk Stirrer (Nilsen Reactor) carries a high torque low RPM motor that effectively, silently and gently mixes your calcium hydroxide (kalkwasser).  This method is not only ideal but is also the...

    $623.69
  • Reef Octopus VarioS CR140 DC Calcium Reactor Reef Octopus VarioS CR140 DC Calcium Reactor Reef Octopus VarioS CR140 DC Calcium Reactor Reef Octopus VarioS CR140 DC Calcium Reactor Reef Octopus VarioS CR140 DC Calcium Reactor

    Reef Octopus

    Reef Octopus VarioS CR140 DC Calcium Reactor

    Reef Octopus VarioS CR140 DC Calcium Reactor,  5.5" dia. up to 200 gal. Footprint: 12.2″ x 9.1″ | Body Diameter: 5.5″ | Height: 23″  Recirculation Pump: Reef Octopus VarioS 2 CALCIUM/ALKALINITY...

    $612.14
  • Tunze Comline 3171 Calcium Automat 3171.000 Tunze Comline 3171 Calcium Automat 3171.000 Tunze Comline 3171 Calcium Automat 3171.000

    Tunze

    Tunze Comline 3171 Calcium Automat 3171.000

    Tunze Comline 3171 Calcium Automat 3171.000 In 1989, TUNZE® Aquarientechnik was the first manufacturer to develop a CO2-controlled calcium reactor. A circulation pump is used to pass the water enriched with carbon dioxide through the hardness...

    $504.99
  • IceCap Kalk Mixing Reactor Large IceCap Kalk Mixing Reactor Large IceCap Kalk Mixing Reactor Large IceCap Kalk Mixing Reactor Large IceCap Kalk Mixing Reactor Large

    IceCap

    IceCap Kalk Mixing Reactor Large

    IceCap Kalk Mixing Reactor Large Large - Ideal for Aquariums up to 300gal+Footprint: 9" x 9" | Body Diameter: 8" | Height: 25" | Holding Capacity: ~3gal GREAT FOR REEF AQUARIUMS Adjustable Speed Magnetic Mixer Solid PVC and Acrylic...

    $438.89
  • Reef Octopus CR140 Calcium Reactor Reef Octopus CR140 Calcium Reactor

    Reef Octopus

    Reef Octopus CR140 Calcium Reactor

     Reef Octopus CR-140 Reverse Flow Calcium Reactor by CoralVue* Quality, design and affordability define the Octopus Calcium Reactor series. Available in 3 different models that feature reverse flow water current for maximum water and Co2contact...

    $427.34
  • Reef Octopus KS150 Nilson Kalk Reactor Reef Octopus KS150 Nilson Kalk Reactor Reef Octopus KS150 Nilson Kalk Reactor Reef Octopus KS150 Nilson Kalk Reactor

    Reef Octopus

    Reef Octopus KS150 Nilson Kalk Reactor

    Reef Octopus KS150 Nilson Kalk Reactor Footprint: 7.68" x 7.68" | Body Diameter: 6" | Height: 26"Requires control timer and feed pump Gently mixes your calcium hydroxide Reef Octopus Kalk Stirrer (Nilsen Reactor) carries a high torque low RPM motor that...

    $415.79
  • IceCap Kalk Mixing Reactor Medium IceCap Kalk Mixing Reactor Medium IceCap Kalk Mixing Reactor Medium IceCap Kalk Mixing Reactor Medium IceCap Kalk Mixing Reactor Medium

    IceCap

    IceCap Kalk Mixing Reactor Medium

    IceCap Kalk Mixing Reactor Medium Medium- Ideal for Aquariums up to 200galFootprint: 7" x 7" | Body Diameter: 6" | Height: 25" | Holding Capacity: 2gal GREAT FOR REEF AQUARIUMS Adjustable Speed Magnetic Mixer Solid PVC and Acrylic...

    $381.14
  • Deluxe Calcium Reactor Package

    AquaCave

    Deluxe Calcium Reactor Package

    Deluxe Calcium Reactor Package Turn your calcium reactor into a complete automated unit by adding our Deluxe CO2 Package.Can be used with any calcium reactor on the market. It includes everything you'll need to setup and automate your calcium dosing...

    $349.95
  • Reef Octopus CR100 Calcium Reactor Reef Octopus CR100 Calcium Reactor

    Reef Octopus

    Reef Octopus CR100 Calcium Reactor

    Octopus CR100 Single 4" Chamber Calcium Reactor w/screw off lid by CoralVue, Rated up to 125 gal. Quality, design and affordability define the Octopus Calcium Reactor series. Available in 3 different models that feature reverse flow water current for...

    $346.49
  • IceCap Kalk Mixing Reactor Small IceCap Kalk Mixing Reactor Small IceCap Kalk Mixing Reactor Small IceCap Kalk Mixing Reactor Small IceCap Kalk Mixing Reactor Small

    IceCap

    IceCap Kalk Mixing Reactor Small

    IceCap Kalk Mixing Reactor Small Small - Ideal for Aquariums up to 100galFootprint: 5.7" x 5.7" | Body Diameter: 5" | Height: 25" | Holding Capacity: 1gal GREAT FOR REEF AQUARIUMS Adjustable Speed Magnetic Mixer Solid PVC and Acrylic...

    $311.84
  • Reef Octopus KS100 Kalkwasser Stirrer Reef Octopus KS100 Kalkwasser Stirrer

    Reef Octopus

    Reef Octopus KS100 Kalkwasser Stirrer

    Gently mixes your calcium hydroxideReef Octopus Kalk Stirrer (Nilsen Reactor) carries a high torque low RPM motor that effectively, silently and gently mixes your calcium hydroxide (kalkwasser).  This method is not only ideal but is also the safest...

    $311.84
  •  Bubble Magus Calcium Reactor CR200WP   Bubble Magus Calcium Reactor CR200WP   Bubble Magus Calcium Reactor CR200WP   Bubble Magus Calcium Reactor CR200WP   Bubble Magus Calcium Reactor CR200WP

    Bubble Magus

    Bubble Magus Calcium Reactor CR200WP

    Bubble Magus Calcium Reactor CR200WP Model:  CR200 WPPump : WP2000 Power : 110V ,40WInternal volume : 6LSize: 9.06 in x 12.29 in x 21.46 in, 230*312*545MMCapacity : 200 - 400 gallons, 800L -1500L aquarium Bubble Magus Calcium Reactor...

    Was: $354.95
    Now: $301.71
  • Bubble Magus Calcium Reactor CR150WP Bubble Magus Calcium Reactor CR150WP Bubble Magus Calcium Reactor CR150WP Bubble Magus Calcium Reactor CR150WP Bubble Magus Calcium Reactor CR150WP

    Bubble Magus

    Bubble Magus Calcium Reactor CR150WP

    Bubble Magus Calcium Reactor CR150WP Model:  CR150 WPPump : WP2000 Power : 110V ,40WInternal volume : 3.5LSize: 7.88 in x 11.11 in x 19.49 in,  200*282*495MMCapacity : 100-200 gallons, 400L-800L  aquarium Bubble Magus...

    Was: $319.95
    Now: $271.96