Calcium reactor vs Kalkwasser reactor

[osubeast]

What is the differnce between these two items and which would you'll prefer.

 

[videoguy]

1st off what type of corals do you plan on keeping?

 

[nigerbang]

Cal reactors are more upfront cost vs Neilson reactors but in the long run are more stable and more forgiving incase something goes wrong..
Cal's can be quite a PITA so dial in just right but once it is you will notice alot better reaction of of the corals

 

[stanlalee]

Kalk reactor isn't going to keep up with a high density sps coral tank, at least not anything larger than a nano. Kalk reactor (or stirrer which is more accurate) is no different than adding Kalk to your top off water except it does it for you. This would probably work to a point (low stocked sps or lps tank) and then it wont be enough. you'll be dosing or still needing a calcium reactor anyway. Calcium reactor dissolves aragonite by lowering pH in the reactor with co2. Sized appropriately these will keep up with the calcium and carbonate needs of any system.