Hi Max, congrats on your new Optima! I add dichlor nightly, after everyone has finished, usually between 10-11pm. I dont add any during the day, I think the chlorine does its work and then its ok for the tub to have a very low level of CL until the evening when I add again. I also have cd ozone running and a Nature2 (SunPurity)
Good luck with your water, I'm amazed at how simple it is.