Best AQUARIUM CALCIUM REACTORS
At Aquarium Accessories Reviews, we take pride in our rigorous review process. Each product is handpicked based on market research, personally tested by our experienced team for functionality and durability, and evaluated for value for money. Alongside our hands-on experience, we also consider real user feedback. This meticulous approach ensures we provide honest, transparent, and comprehensive reviews to guide your aquarium accessory purchases.
1
Seachem Reef Kalkwasser 250gram
Seachem Store
4.7 ✓
2
Glo AquaMaxx Nano Star Calcium Reactor
Brand: Glo
3.1 ✓
3
Kent Marine Concentrated Liquid Calcium Bottle 8 Fluid Ounces
Kent Marine Store
4.7 ✓
4
Two Little Fishies ATLPBR150 GFO PhosBan Reactor 150
Brand: Two Little Fishies
4.5 ✓
5
Viaaqua AC10 Acro-Cal Calcium Reactor
Brand: ViaAqua
4.3 ✓
6
Two Little Fishies PhosBan Reactor Extension Kit
Brand: Two Little Fishies
4.5 ✓
7
Deltec PF601S Fluidized Calcium Reactor
Brand: Deltec
4 ✓
8
Seachem Reef Complete 500ml
Seachem Store
4.7 ✓
9
Two Little Fishies ATLRB4 Reborn Calicium 8.8-Pound
Brand: Two Little Fishies
4.1 ✓
10
Two Little Fishies ATLPBR550 GFO PhosBan Reactor 550
Brand: Two Little Fishies
3.8 ✓
We will continue to update this buyer's guide once a month or two.
The best AQUARIUM CALCIUM REACTORS in 2024 - Detailed Product Descriptions
1. Seachem Reef Kalkwasser 250gram
More PhotoPURE: Reef Kalkwasser is a pure calcium hydroxide with unmatched purity and solubility characteristics.
MAINTAIN: Calcium hydroxide is used to prepare limewater (kalkwasser) solutions that will maintain calcium concentrations at natural sea water levels. Kalkwasser solutions maintain calcium directly and carbonate alkalinity indirectly.
CAPACITY: Reef Kalkwasser’s capacity to perform these functions is dependent on evaporation rate and CO2 concentration.
USE: If evaporation rate and CO2 concentration are insufficient you can provide additional calcium with Seachem’s Reef Advantage Calcium, Reef Complete, or Reef Calcium, and carbonate alkalinity with Reef Builder or Reef Carbonate.
DIRECTIONS: Never add this product directly to the tank. Add 3g (1 teaspoon) to 4L (1 US gallon) of water and mix to dissolve. If using pure water, a fully saturated solution is prepared by adding 6g (2 teaspoons) to 4L (1 US gallon). Drip solution into tank. Beware of overdose and use only what is needed to maintain desired calcium level.
2. Glo AquaMaxx Nano Star Calcium Reactor
By Brand: Glo
T8 25mm diameter bulb fits standard and electric ballasts
Ideal spectral peaks for enhancing fish color
Strong photosynthetic spectrum range to stimulate vigorous plant growth
Energy efficient; High CRI values for accurate viewing of aquarium
Recommended for combination with Power-Glo or Life-Glo
3. Kent Marine Concentrated Liquid Calcium Bottle 8 Fluid Ounces
Bio-Available calcium supplement
Perfect for reef type marine aquariums
Contains no EDTA
Product gets very hot when dissolved in water
Not for human consumption
4. Two Little Fishies ATLPBR150 GFO PhosBan Reactor 150
Capacity: Use with up to a maximum of 200 grams (385 ml) of PhosBan, or a media height of 5 inches (13 cm)
Aquarium size: One reactor for up to 150 gallons (568 Liters). Multiple reactors may be used for larger aquariums.
Recommended flow rate: ca. 20 - 30 gal/hr (75 - 115 l/hr) . Too much flow can grind PhosBan
Connection for hoses 1/2 inch (12.7 mm) i.d. The inlet and outlet flexible 90° fittings rotate to suit your installation
5. Viaaqua AC10 Acro-Cal Calcium Reactor
Built in water pump and bleed valve
For use in sump or hang on the back
For aquariums up to 75 gallons
4" wide x 15" high
Carbon dioxide source not included
6. Two Little Fishies PhosBan Reactor Extension Kit
For flexible and space-saving pipe connections
PhosBan Reactor 150 is mounted on the back of the aquarium
PhosBan Reactor 150 is mounted on the side of a filter sump
8. Seachem Reef Complete 500ml
Liquid ionic calcium source
160, 000 mg/L (most concentrated on the market) vs. 100, 000 mg/L
100% soluble. Be wary of products that are Milky White or need to be shaken
9. Two Little Fishies ATLRB4 Reborn Calicium 8.8-Pound
Country Of Origin : United States
The Package Height Of The Product Is 0.02 Inches
The Package Length Of The Product Is 0.02 Inches
The Package Width Of The Product Is 0.02 Inches
10. Two Little Fishies ATLPBR550 GFO PhosBan Reactor 550
Two Little Fishies Phosban Reactor
The PhosBan Reactor 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
Two Little Fishies Phosban Reactor
The PhosBan Reactor 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
11. Two Little Fishies Reborn-Calcium Reactor Media, 44-Pound
Coarse aragonite media for calcium reactors
Composed of fossil skeletons of reef building corals
Use in a calcium reactor to replenish calcium and carbonate alkalinity, strontium and trace elements
12. AquaMaxx Fluidized GFO and Carbon Filter Media Reactor
Reactor Footprint: 5.5" x 5.
Chamber Diameter: 3.9
Reactor Height: 15.3
Chamber Capacity: 0.18 Gallo
Inlet/Outlet: 3/4" hosebarb
13. Instant Ocean Reef Accelerator for Coral Growth 250 mL, All-in-One Reef Supplement
ALL-IN-ONE REEF SUPPLEMENT: Use regularly to encourage the growth of corals and purple algae
RESTORES: Replenishes calcium, magnesium, strontium, iodine and trace elements – essential minerals that quickly become depleted in reef aquariums
ADVANCED CHEMISTRY: Supplies essential minerals that are necessary for growth of marine invertebrates and coralline algae
NITRATE-FREE: Contains no nitrates, phosphates or silicates
EASY DOSING: No mixing or complicated reactors
14. JBJ Accela Water Pump for Aquarium, 266GPH, Black
A submersible pump and power head is build to perform and last under the harshest conditions; ideal for wave makers; protein skimmer; calcium reactors; Nano aquarium replacement pump.
Triple suction cup mount
Fully rotational output
Country Of Origin: China
15. Aquatop Media Reactor with 95 GPH Pump – For 10-75 Gallon Tanks, Up-Flow Filtration for Efficiency, Includes Adjustable Water Pump, Reliable Filtration System, MR-20
EFFICIENT FILTER MEDIA: Aquatop's MR-20 Multimedia Reactor maximizes the efficiency of filter media with a reverse water flow design that eliminates water channeling through the filter media.
VERSATILE AQUARIUM ACCESSORY: Install in sump or hang on the tank, this versatile reactor tank can be used for phosphate resins, phosphate sponges, activated carbon, nitrate sponges, and other resin filter media.
ADJUSTABLE FLOW WATER PUMP: This fish tank reactor includes Aquatop’s SWP-230 adjustable flow water pump and sediment discharge filter.
RELIABLE FILTRATION MEDIA: The high-quality acrylic design makes this one of the most reliable media reactors available to help create a better environment for your aquatic life with up-flow water filtration.
READY & EASY TO USE: This aquarium media reactor comes ready to use with a pump, intake and output tubing, and all the necessary plumbing. It also comes with an easy to remove lid with recessed o-ring.
16. AquaMaxx FR-SE GFO Hang-On Filter Media Reactor
HIGH QUALITY REACTOR: Accommodates aquarium rims up to 1"
Using GFO: up to 150 gallons
Using Activate Carbon: up to 75 gallons
Using BioPellets: up to 50 gallons
PUMP AND TUBING SOLD SEPARATELY. Inlet/Outlet: 1/2" hosebarb. Accommodates aquarium rims up to 1"
17. TAAM Rio 200 Power Surface Skimmer and Co2+ Reactor with Magnet Mount
By Brand: TAAM
138 gallon per hour pump
For aquarium up to 36" long
Magnet mount included
Easy to use
18. AquaMaxx Fr-s Internal GFO Carbon and Biopellet Filter Media Reactor with Sicce Pump by AquaMaxx
Footprint: 3.4" x 3.2"
Chamber Diameter: 2.4" Height: 10"
Maximum Capacity: 0.25L (250mL) ~1 Cup
Glass thickness: up to 3/8"
Pump(included): SICCE Micra or Syncra Nano
19. Seachem 28668 Medium Reef Reactor
Water balance: Seachem Reef Reactor is a high-purity source of aragonite, which supplies all important elements for optimal ionic balance and robust coral growth and coloration in reef aquaria.
Grain Size : With a grain size of approximately 0.5-1 cm, Reef Reactor is intended for use in calcium reactors where it is slowly dissolved with the addition of carbon dioxide.
Support: As it dissolves, Reef Reactor provides calcium, magnesium, strontium, potassium, and carbonates among other important elements for reef aquaria
Stabilization Reef Reactor is excellent at increasing and stabilizing alkalinity, which also supports a stable pH and encourages the rapid formation of coral skeletal material.
21. Seachem 28667 Medium Reef Reactor
Provides calcium, Magnesium, strontium, Potassium, and carbonates
Made in United States
0.5-1 cm Grain size
High-purity calcium reactor media
22. Macro Aqua NP-200 Hang-on External Biopellet Reactor with 200ml NP Pellets
High quality external biopellet reactor. Nitrate phosphate removal
Perfect equipment for coral tanks
Easy installation and maintenance
Comes with 200ml NP Pellets (replace or add new biopellets every 6 months)
Compact design that saves space in an aquarium
24. ISTA I-539 External Reactor
By Brand: ISTA
For 158 to 264gph, Flow Rate (600-1000 L/H)
Patented impeller design, completely crushes CO2 bubbles
Compact size for saving space, suitable to set external or internal
Durable material for preventing deformation and acid resistant
Easy to clean, and simple to maintain
25. Jebao/Jecod DCS-1200 DC Water Pump 320GPH 4.9ft for Marine Reef Tanks Sump Skimmer Protein
By Brand: Jebao
Jebao DCS-1200 DC aquarium pump is the upgraded version of the ordiginal DC-1200, ideally used as a circulation pump or used for calcium reactor;it does not have a wheel impeller,listed pump is supposed to use as a return/circulation pump,need to change the wheel impeller then can be used in a skimmer.
12 W Power Consumption, 1200 Liters (320 gallon) per hour flow rate,1.5M Max lift head, can be used as inline or submersible pump;
Jebao DCS1200 comes with a 8 Speed adjustable controller with FEED Mode,Automatic power-off protection upon no water or impeller blocked;
This Aquarium DC return pump comes with high performance DC24V motor , energy saving up to 50%;
The nano dc pump can be used in Marine and Fresh Water,noise level around 30db.
26. Reef Octopus VarioS CR140 5.5 inch Calcium Reactor
Variable Speed, Apex Ready Pump
Reverse flow and CO2 Recirculating Design
Reverse flow and CO2 Recirculating Design
27. Aqueon Shrimp Essentials 4 Fluid Ounces
By Aqueon Store
Freshwater shrimp and crayfish need additional nutrients for molting and osmoregulation
Replaces minerals and trace elements needed for strong exoskeleton development
Suggested to remove chemical filtration, such as carbon, temporarily when dosing
Ideal for all freshwater shrimp, crawfish and lobsters
Convenient dosage cap is included - Add 5mL (1 tsp) for every 1 gallon of temperature adjusted tap or purified water
29. Kamoer FX-STP Peristaltic Pump
Dosing Pump for Countinuous Use
Dimensions -5in (h) x 3¼in (w) x 5¼in (d)
Quiet operation
Adjustable flow rate setting of 1 to 120ml/min
30. QANVEE Fluidized Moving Bed Filter Bubble Bio Media Reactor for Aquarium Fish Tank with Air Stone and Sponge Filter
Self Cleaning Filter Media constantly moving around and rub against each other
Simply Hook up to an Air Pump and getting all the benefits of oxygen in the water and a super charged bio filter
Oxygen Rich Water combined with strong nitrifying- handle large amounts of ammonia and nitrite compare to other type of filter
Easy to take out Intake Sponge provides additional physical filteration
Comes with Enough Media similiar to K1 micro will float at first and start tumbling in a few days
31. SunGrow Snail and Crayfish Energy Balls, Enhance Color, Calcium-Rich Gray Pearls for Invertebrates, Functional and Beneficial Cool Décor, 10-Piece
Energy-booster and assists in multiplication --- Calcium-enriched, Snail and Crayfish Energy Balls by SunGrow are an excellent source of nourishment. It helps activate the muscles and develop strong bones of shelled gastropod and decapod, making them energetic. An agile and active breed also multiplies in higher numbers.
Imparts color --- SunGrow Beads provide vibrant colors for your pets, ensuring they’re in tip-top condition. You will notice a considerable difference in your invertebrates in just a short period. They will become more active, and the crawdads’ fins will become brighter in color. The spiral-shaped snail shell, which shields the internal organs and soft body, will also become stronger.
Makes them live longer --- These SunGrow balls for freshwater invertebrates rejuvenate them and improves their system. The popular crawfish and snail develop better physical conditions once they start nibbling on them, resulting in longer life.
Not just for fish, it also results in plant growth --- If you have live plants in your tank, you may notice a significant increase in their development. The balls consist of iron, boron, and manganese. So, add these balls and see the difference for yourself.
It functions as aquarium decor but is also great with other aquatic life --- Aside from providing significant benefits to your pets, these energy balls would also look great in your tank. Its round shape and color perfectly fit any theme you want to convey by giving a distinctly rustic look and feel. Plants will benefit from these beads if you place these balls in a substrate near plants.
32. Tunze Macroalgae Reactor 3181
By Tunze Store
Complete, includes pump and light
Made in Germany
2 Year Warranty
33. Two Little Fishies Little Reborn Calcium Reactor Media, 4 Kilo
Two Little Fishies Little Reborn Calcium Reactor Media, 4 Kilo, is composed of the fossil skeletons of reef building corals sustainably harvested from pristine sites in the Western Pacific.
When used in a calcium reactor, the media will dissolve (at appropriate pH levels), replenishing calcium, carbonate alkalinity, strontium and trace elements.
The coarse size of Little ReBorn allows for unrestricted water flow and easy diffusion of carbon dioxide, for maximum efficiency and easy maintenance of the calcium reactor.
ReBorn dissolves completely and will not turn to mush!
The size of the shells and coral pieces for Little Reborn is slightly smaller then the original version.
34. JOR Shrimps, Isopods, Crayfish, and Snails Rocks, 3.5 Ounce, Adds Vibrancy to Aquatic Life, Ideal for Baby Shrimps, Rustic Decor for Big and Nano Tanks, Fish Bowls, and Jars
By Brand: JOR
Calcium helps shedding --- Shrimps add vibrancy to your aquatic life and make great pets. JOR’s calcium-enriched rocks facilitate shrimp’s longevity. Japanese shrimp breeders have a firm belief in stones and they use them in their breeding facilities. You can beautify your aquarium with these color and age enhancing rocks by JOR. A must-have for shrimps, especially Crystal red shrimps, Amano shrimps and Ghost shrimps.
For holistic habitat and overall development --- If your shrimps are losing color and not look as vibrant as before, here is your solution - JOR Rocks. Our rocks provide the perfect balance for vitality, color and growth, especially for baby shrimps in growing age. They are rich in calcium that helps shrimp with building stronger shells, and full of magnesium that is essential for all crustaceans to maintain vibrancy.
Clearer water --- The 3.5 oz stones from JOR act as an ion exchanger that clears water in the aquarium. They enrich water with necessary minerals that enable shrimps to live longer. It even stores substances like heavy metals and ammonium for a longer duration.
Creates a holistic habitat for your aquatic pets --- Thanks to their unique stratification and composition, JOR’s mineral stones help create a thriving aquatic habitat. They are also beneficial for aquarium hydrophytes by converting fish excreta into mineral-rich manure.
Aquarium decor --- The applications of these Rocks don’t just stop here! You can even make use of them in home furnishing by placing them in all the corners of a square or rectangular mirror. Else, place these on the center table of your living room in a bowl filled with water along with a few colored pebbles, marimos, and other plants.
35. IceCap Color Changing CO2 Absorbent Media 1kg
Struggling with low pH? Frustrated by slow coral growth? The IceCap Color Changing CO2 Absorbent Media is a solution.
This IceCap CO2 Absorbent Media must be used with a CO2 Scrubber, such as the IceCap CO2 Scrubber (it also requires a protein skimmer). The way it works is simple: you just attach the tubing that comes with the scrubber to the air intake on your skimmer. Then, you connect the other end to the CO2 scrubber and you're done. That's it! Now you'll be able to raise the pH of your aquarium and control carbon dioxide.
When the media turns pink, then it's time to replace the media. Or, if your pH drops, it's time to replace the media.
1 kg. Precise mixture of Calcium hydroxide (Ca(OH)₂) and Sodium Hydroxide (NaOH). Turns pink when used up. Perfectly pelletized size for minimal dust and maximum performance.
NOTE: You must have a CO2 scrubber and protein skimmer to use this products.
36. Monitor Calcium/Magnesium Low Salinity (0-5 PPT) Test KIT (120 Tests) - Monitor Aquarium and aquaculture Water Quality
Test calcium (Ca) and magnesium (Mg) level in water. Suitable for freshwater and brackish water with the salinity between 0 - 5 part per thousand (ppt).
For freshwater and marine aquarium and aquaculture, pond water, ground water, drinking water
Ca range from 0 – 200 part per million (ppm) with the resolution of 20 ppm per drop. Mg range from 0 – 960 ppm with the resolution of 12.15 ppm per drop
Can measure 120 tests
Easy to use, accurate, fast test, economic
37. Monitor Calcium/Magnesium HIGH Salinity (Salinity > 5 PPT) Test KIT (120 Tests) - Monitor Aquarium and aquaculture Water Quality
Test calcium (Ca) and magnesium (Mg) level in water. Suitable for brackish water and seawater with the salinity higher than 5 part per thousand (ppt).
For freshwater and marine aquarium and aquaculture, pond water, ground water, drinking water
Ca range from 0 – 800 part per million (ppm) with the resolution of 40 ppm per drop. Mg range from 0 – 1725 ppm with the resolution of 50 ppm per drop.
Can measure 120 tests
Easy to use, accurate, fast test, economic
38. Kamoer X1 PRO-T 70ml/min small programmable auto aquarium dosing pump 12V calcium pump Wifi control low flow stepper motor adjustable peristaltic pump
Flow rate > 70ml/min, weight 316g (excluding power adapter), input: 100VAC~240VAC, output: DC 12V, 2A, speed range 0.1~350 rpm, minimum addition volume: 0.1ml, titration times: 24 times/day~1 time/99 days.
Support Wifi control with long life stepper motor (meet both precise adding and long time use requirements), if you can't connect APP, please contact us, we will definitely help you until you connect. (This product only supports 2.4G Wi-Fi, not 5G Wi-Fi).
X1 PRO T dosing pump as a single head titration pump, can supplement trace elements required by various organisms. As a calcium counter-peristaltic pump, it can provide a steady flow of water to the calcium reactor. By automating the addition, it greatly reduces the workload of manual addition and also avoids mistakes caused by manual addition such as missed addition, over- or under-addition.
Working mode: manual mode, continuous mode, automatic mode, with flow calibration function, support setting multiple groups of custom time periods. With power-off memory function. Support iOS & Android system operation interface.
X1 PRO T stepper mini peristaltic dosing pump adopts plastic gear pump, no slipping and rusting problem. Adopt high reliability threaded joint to avoid liquid leakage problem. Long life imported pump tube is equipped as standard.
39. OneCove Aquarium Calcium Reactor for Reef Tank (CR-120 (10W, 80-265 Gal))
Three different chambers allow the medias to efficiently circulate and fully react.
Main chamber and second chamber can be connected or separated by valve.
Draw in water automatically without the need for a separate feed pump.
The colored tubes help sort out the different paths of water flow.
Superior performance, pretty quiet, long life service Auqabee UP1000/AC 10 watt impeller pump made in Germany.
Up-flow design prevents clogging and improves water circulation.
CO2 bubble counter and adjustable air flowmeter make the CO2 intake control more accurately.
40. Kamoer X1 PRO T2 small programmable auto dosing pump 24V 110 ml/min calcium pump Wi-Fi control continuous flow stepper motor adjustable peristaltic pump for aquarium
Size: 93x100x108 mm (L x W x H), weight: 534g (without power adapter), input voltage 100VAC-240VAC, output voltage 24V DC, current 1.9A, pump head rotor number 3, flow rate ≤110ml/min, accuracy around 2%, working ambient temperature 0-70 ℃, humidity 10%-90% (non-condensing), storage environment temperature -20 ℃ ~ 85 ℃, humidity 10%-90% (non-condensing).
X1 PRO T2 can be used as dosing pump, it can flexibly and accurately replenish various elements required for marine growth, such as calcium, magnesium, KH enhancer, trace elements, etc. to the marine tank.
X1 PRO T2 also can be used as calcium pump, it can provide stable flow of water for calcium reactor.
Product features: Use stepper motor to ensure stable operation for a long time; OLED display, with rotary encoder to achieve local control; remote control via App, support iOS and Android system; memory function, maintain the state before power failure after power failure recovery, set parameters are not lost when power is lost; use imported PharMed BPT pump tube; support remote upgrade firmware.
Software features: flow calibration function; adjustable running speed, maximum flow rate up to 110 ml/min; pump tube use time statistics and life alarm.
Note one: Please use the power adapter that comes with the product and work under the specified working environment. This product only supports 2.4G Wi-Fi, not 5G Wi-Fi. the device should be placed in a reasonable position, the connection tube of liquid inlet should be as short as possible, and the connection tube of liquid outlet should be overhanging above the cylinder. Please check carefully if the liquid inlet and outlet are connected in the right direction, never connect them backwards.
Note two：If there is a situation that you cannot connect APP Wifi, please contact us, we promise to help you until you connect.
Note three：Related pump head/tubing replacement accessories can be found in the "Accessories" section of the store.
