Do you think two part is more effective?
Not more effective... I think a calcium reactor is the most pure way to add all the elements your corals require, including trace elements. However, two part is far safer than a reactor. When I first started using the reactor my effluent was a slow steady drip. When my system was at its peak it became a steady flow. And with an effluent PH of 6.6-6.7 if anything went wrong it would cost me my entire system. So I guess I just lost my nerve, and the risk know longer out weighed the reward. But for a smaller system without a heavy calcium load I would use one again. Thats why I never sold it.
I use baking soda and turbo calcium. 3 cups of each will last a week, and keep my CA 450 and ALK 10dkh on the money.