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Home » Saltwater Aquarium Supplies  » Calcium Reactors  » Kalkwasser Reactors  »  Precision Marine Kalkreactor KR620
Precision Marine Kalkreactor KR620

Precision Marine Kalkreactor KR620

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MSRP: $362.99
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Precision Marine Kalkreactor KR620 Information

Product Manuals & Documentation

At Precision Marine there are two ways Calcium can be added to your reef tank, the Calcium Reactor or the Kalkreactor pictured here. You can either gravity feed through the Kalkreactor from a freshwater top-off system to your reservoir, or use a dosing pump.

A reliable water pump is used in lieu of the magnetic stir bar, which tends to jam, bind and wear the acrylic.

This model also includes a threaded opening at the top to enable adding Kalk powder without removing the lid.


KR620 Specifications:
  • Overall Height: 20"
  • Reaction Tube Diameter: 6"
  • Reaction Tube Height: 18"
  • Base Diameter: 7.75"
  • Water inlet and outlet size: 1/4" Polypropylene tubing
  • Method of feeding: Gravity or Pressure
  • Supplied Water Pump: Maxi-Jet 400

Manufacturer Info

Precision Marine
For nearly a decade Precision Marine Systems has been the leader in the trade, creating top-performing, innovative components. Often imitated, but never equaled. Designers of the acclaimed Bullet Series line of foam fractionators, find out why public aquaria, custom installers and retailers alike choose Precision Marine Systems as their premier line of marine filtration.


Manufacturer`s Warranty: 1 year from date of purchase

Precision Marine Kalkreactor KR620 Reviews

Average Rating
(10 reviews)
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Works Great

Reviewers Rating Great

Posted: 11/20/2012 from PALMDALE, CA UNITED STATES
3.5 5
Experience Level: Intermediate

Comments: This product works great. My only downfall as to why I rated it a little low was because the top screw will leak - even with the O ring provided. I has to threat it with plumbers tape and caulking on the top to prevent it from leaking. Ensure you have the pump stirrer on a timer as it cannot run continuously. Overall, very good product and worth the investment.... only downfall is me having to manually plug the top to prevent leaking.

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After 2 years Still love this!

Reviewers Rating Excellent!

Posted: 6/8/2011 from Hyrum, UT UNITED STATES
5.0 5
Experience Level: Intermediate

Comments: These are built out of cell cast Acrylic. Dont be fooled by the other brands that are in its same price range.You will want to have extra impellers for the maxi Jet 400. Like anything they fail. I replace mine about each year when they break. Make sure you run the pump the least you can which is 4 15 min times each day. I would recommend buying a digital timer that can do 4 separate cycles. There is also a rubber O ring on top with a threaded cap. That O ring will also go out if your constantly adding kalk there. I would not even bother using that, and just open the main top, clean and refill. Hope this helps! Great unit!

8 of 8 People found this review helpful, did you? Yes No

quality build, easy to refill

Reviewers Rating Great

Posted: 12/15/2010 from Los Angeles, CA
4.0 5
Experience Level: Intermediate

Comments: This is another well built & designed product from PM. I had to replace a 4-year old stirbar-type mixer. I feed 6 liters a day of RO/DI through a Litermeter III. After 2 months of use I can already tell I will have to replace the maxijet impeller within the year. But I guess they are cheap. Stirbar-types are indeed superior. Too bad they are twice as expensive. But, what limits most guys with kalkstirrers from using them is the constant need to refill kalk without making a powdery mess and loosing skin on teflon screws. This is the best part of the PM reactor is the top refill port, which I have to use bi-weekly. Using a funnel and some silicon on the seal, I have not had a single leak or spill.

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Pleased after several months.

Reviewers Rating Excellent!

Posted: 3/28/2010 from PITTSBURGH, PA UNITED STATES
5.0 5
Experience Level: Intermediate

Comments: I always review a product carefully. I have been using this kalkreactor for a few months now and I am very pleased with it's operation. Nicely made product and easy to use. I have the pump kick on and stir for 20 minutes 4 times a day & have it in line with my Tunze osmolator. This product will suit your kalk needs.

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Reviewers Rating Excellent!

Posted: 3/26/2010 from Morehead City, NC UNITED STATE
5.0 5
Experience Level: Expert

Comments: First,the quality of this product is #1. You definetly get your money's worth. Second, set up is easy. I bought an additional Tom's aqua lifter(dosing pump) and attached it to the out line from the reactor and from the dosing pump, ran a line to my refugium. On my reefkeeper elite system, I programmed it to stir 4 times a day for 15 minutes and to dose from the reactor if my ph falls below 8.4. Perfect thus far and has run flawlessly. If you dont have a reefkeeper or similar unit, I would highly suggest buying a timer for the reactor to have it stir 4 times a day for 15 minutes each cycle. As far as how much to dose, this reactor allows you to either dose the kalkwasser from the reactor by gravity or by dosing pump, so a little experimentation will be involved there until you dial in the correct drip rate or dose time. This is the third product I have purchased from Precision Marine and I havent yet been dissapointed. Good job Precision Marine.

2 of 3 People found this review helpful, did you? Yes No

Easy way to add Kalkwasser

Reviewers Rating Great

Posted: 11/20/2008 from LANESBORO, MA UNITED STATES
4.0 5
Experience Level: Intermediate

Comments: This is the second unit I have purchased. They are well-made, but over time I have had one develop a leak around where the stirring pump return pipe enters the tower. I fill it with 600 grams of KOH, and it will dose my 150 gallon soft and LPS coral setup for about 3 - 4 months. It is important to check the blades on the pump impeller periodically as they do wear down and/or break off over time. It's also easy to test the KW supply. Just unscrew the port in the top, and drop in a pH probe. If the pH is 12.1 or higher, all is well. Below 12, think about refilling the unit. Down around 11.6, and the KW supply is pretty much exhausted.

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Reviewers Rating Excellent!

Posted: 6/4/2008 from DAVIE, FL UNITED STATES
5.0 5
Experience Level: Expert

Comments: Works great! You might go through some Maxi Jet 400 impellers, so stock up! Also, its not meant to be pressurized, so don't plan on putting it inline between your RO/DI and your float valve. It will leak around the impeller shrouding if you do. So you must drip via gravity (not recommended as lines clog with algae [inlet side] or kalk [outlet side] and it's not reliable) or better yet, invest in a Litermeter or similar dosing pump.

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Great Reactor

Reviewers Rating Excellent!

Posted: 1/23/2008 from Columbia, NJ UNITED STATES
5.0 5
Experience Level: Intermediate

Comments: My SPS took of after I hooked one of these guys up. I think it's a must buy if you have SPS.

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First day of getting it.

Reviewers Rating Excellent!

Posted: 8/23/2007 from ST.PETERS, MO UNITED STATES
5.0 5
Experience Level: Beginner

Comments: This is twice are large as my Korallin 1502 calcium reactor and much cheaper??? Yes I'm now using both. Great design, mixes great. Love the center screw cap where you can put more in without taking the whole top off, sweet. This is done by mixing with water and pouring in top with a funnel. I used three heaping cups. Hard R/0 type hose comes with it, but to get it to drip you need a connector to go to the soft type hose so you can put a pitch valve dripping it in the sump. (at night). I bought a five gallon jug where I put R/0 Di water in. Then I bought the Tom's Aqua lifter which sucks up the water from the jug into the reactor and then drips the mixture into the sump. Two part, timer is recommended, one for the Tom's Aqua Lifter and one for the mixing pump. Directions say you don't need to leave the mixing pump on all the time. Have it come on four times a day for 15 minutes each. I like to leave it on to mix while it's dripping. (over night). Use Caution!!! Raises PH, which is one of the reasons I bought it, thought it would help keep ph up when lights are off during the evening but after playing with it some I may leave it drip all the time, not sure yet.

5 of 6 People found this review helpful, did you? Yes No

Great Product

Reviewers Rating Excellent!

5.0 5

Comments: I love this unit. Works perfect. Designed well! Good job PM!

5 of 8 People found this review helpful, did you? Yes No

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