I also have a program for the air pump with 2 airstones in the sump. Whenever the Ozonizer turn on, air pump will pump in extra air to the water inside the sump and it will keep on for 10 mins. after the ozonizer switch off to get rid of the leftover/unused ozone in the water.Here are my program. I have an overflow sensor build in the skimmer. If the skimmer stop, Ozone stop. If I was feeding my fish (when the sump pump) slow down to 1 % during feeding, Ozonizer stop. When I am doing maintenance work in the tank (I use FeedD) ozonizer stop. When I dose amino acid (FeedB), ozonizer stop. When OPR reading over 430, ozonizer stop. When AC power off, UPS kick in, Ozonizer stop.