From what I understand, that would be referring to adding in water chemistry supplements. You can buy drip pumps to keep your chemistry correct. Things I dose are:
Drip in a saturated kalkwasser solution. I have the dosing for this set up to drip in the solution for 2 minutes every hour IF the time is between 9 pm and 7 am, and also if the pH is less than 8.2. (so it doesn't happen if the pH is over 8.2, or during the daytime.) Kalkwasser supplements in calcium for the coral skeletons, and also raises pH (the saturated solution is 12.1 N or something like that)
When I do water changes, I've figured out I need to add in 1 tbsp. Mg supplement and 1 tbst. hardness supplement. I could do these with a dosing pump so it would drip into the tank at some set amount, but I do weekly water changes, and just add it when I do them. Seems to work good.