Pros:
- Cheaper than Ca. Rxtr.
- Pulls phosphates from the water
- Takes some work out of dosing
Cons:
- Potential PH spike (nuking)of the tank if not set up properly
- Potential PH issues if your is high already
I could go on but its getting late. If you want to get nitty gritty there are pros and cons to every thing. I run a Ca. Rxtr and a kalk reactor and like them both. I know some people that wont, or quit using a kalk Rxtr due to the potential nuking issues.