How do YOU control your calcium reactor?

[TheReefGeek]

Looking for information from people who use calcium reactors.

How do you control your calcium reactor?

1. Manual adjusting of the bubble count and drip rate to get desired calcium and alk levels
2. Ph controller hooked up to display tank
3. Ph controller hooked up to effluent from reactor
4. Other method

Basically I want to setup my calcium reactor and am looking for what people have done and tried and found successfull. I currently do not have a Ph controller but would invest in one if it makes maintenance easier, because I am a big fan of low manual maintenance.