closed....
The osmolator is on a timer to run at night only, and turns on and off a few times during the night. It has a safety feature that shuts the pump off after 10 minutes if it doesn't fill the sump(and with the flow set to a drip because of the limewater, it probably won't fill in 10 minutes), and then has to be manually reset, so I have it shut off and restart every couple of hours.