Someone asked a few days ago "why I would like my Apex probes to be calibrated right"
To answer that question; have a controller with probes can be a great thing if setup of properly and everything is calibrated properly. Let take conductivity for example, and I am discovering this and very excited after setting up my Auto Water Change. For the past two years since I installed my controller I have watched my conductivity and made sure the conductivity would stay the same. I will say it again, that I watch to make sure the conductivity stayed the same. Since I now have a ATO, New Saltwater reserve, and a doser connected to the controller I do not have to watch anymore, just check and set alarms.
Let's say my salinity/conductivity starts creeping up because I mix to much salt in my saltwater reserve, my mineral salts from component 3+ is elevating the conductivity, or evaporation. The doser along with the controller set up with the correct statement can not adjust my salinity/conductivity automatically to keep my number more consistent. They there will be the other side that will say "what if" that is why there are alarms and notification
This is all happening with a AWC now in place,
No more bucketing water around the house,
No big mixing station,
No more draining the sump and leaving the drain open by accident,
No more being distracted and forgetting that the sump is dry during a water change

The list could go on.
I have also been asked and read, "why do I need a controller?" No one really tells you why the answer I got when I ask " is for piece of mind" no more no less information. Which is kind of true but that is not telling me or us why a controller is to nice. how about having a life beside being chained to reefing before it become a burden, should be the answer. I have had my controller sometime now as I stated above and I am just realizing what I can do and realizing why the push for automated testing is the next big step to reef automation.
If someone were to ask me now?
Feeding
Manitance
Auto water changes
Adjusting conductivity
Sensors for water levels and controlling different equipment .
Sensors for alarms to notify us when something needs to be looked at.
Adjust PH
Adjust Temperture
Adjust parameters
Controlling lighting
Controlling flow
Controlling reactor
I will discover more as this journey with a controller goes on, but I thought I would share this and may come back to this later a elaverate
Also, I am glad I put the drain in
