View Full Version : difference b/w calcium and kalk reactor

01/01/2007, 08:38 PM
Are these the same things with different names? Do they do anything different?

01/01/2007, 08:45 PM
Calcium reactor:
Runs 24/7
Can add a LOT more ca/alk
More expensive
Doesn't raise the pH

Kalk reactor:
Most people run it just for topoff
Restricted by amount of topoff necesary
Restricted by pH (kalk has a pH of 12)

I use both.

01/01/2007, 08:47 PM
But both essentially add Ca and Alk to the system?

01/01/2007, 08:50 PM

For tanks with low calcium demand (mixed reefs without a lot of SPS/clams), a kalk reactor can usually keep up. Once you start getting a lot of clams or a lot of SPS colonies, then you need a calcium reactor.

01/01/2007, 08:52 PM
Ahh. Thanks for clarifying.
Then once you have a calcium reactor, whats the use of having the kalk reactor on the same system if the calcium reactor is running 24/7?

01/01/2007, 09:05 PM
I use a kalk reactor because it keeps my pH up... my pH will drop to 7.65 at night without one... Thanks to my kalk reactor, my pH is 8.10 ALL day long (I control the kalk with pH and autotopoff)

Some people notice their calcium reactor dropping the pH. It really depends how much CO2 you are putting in and how effectively it is being used.