I've used both methods. Currently I've got a GEO reactor and it has been set and forget. Change the media and add CO2 every 7 or 8 months. The only issue has been a faulty needle valve which was replaced.
I got tired of manually dosing 3-part. I could've gone with a auto-doser but a reactor seemed more mad scientist-like. I remember reading a RHF article comparing various methods and their cost. I think that somewhere around the 125 gallon mark a calcium reactor becomes more economical in the long run than dosing.
Like was said: two ways to the same result - there's more than one way to skin a cat.
|