Water chemistry is a huge deal in reef aquariums and there are many methods to help maintain good water quality. Because there are so many options it can be overwhelming on first glance, and it takes some time to figure out what they all do and what makes sense for your home aquarium. Let’s take a look at calcium reactors. Right off the bat, it has a scary name. Calcium. Reactor. I need a reactor for my tank? It’s actually not THAT complicated. It is essentially just a chamber that recirculates water and slowly dissolves calcium carbonate media.
See more here:Calcium Reactors Explained