I don't have the DOS but from a quick search, goto tasks and select "DOS Additive Dosing" Select the time frame and how much you want to dose and it should break it up. It'll dose 15 times in that time frame @ 3.33 mL per dose.
Then for the kalk stirrer, input the above OSC statement which will mix the slurry for 5 minutes every 4 hours.
for the DOS, if you can do an advanced statement, put
if Stirrer = on then off
defer 5:00 then on
Personally I'd give the slurry closer to 20 minutes to start settling.
So if the doser goes to dose, it will see the statement and check. If the stirrer is currently running, it will wait five minutes and then start dosing.
I would check out some examples on this site and google. There is a plethora of information.