Calcium Reactors
 

So just what is the purpose of a Calcium Reactor? I know it produces calcium for tanks ... is it just for certain corals or what.

Thanks

It supplies balanced calcium and alk buffer. Mostly used for calcium demanding tanks like tanks full of sps corals.

There was a really good writeup posted here.
http://www.canreef.com/vbulletin/showthread.php?t=20012