I have been using the osmolator for a couple of weeks and am very happy with it, great piece of mind. I have been having problems with low ph at night so I want to use kalk, maybe in a nielsen reactor but only at night. Is there a way of using the osmolator to control two pumps. One to use with normal top-off during the day and with a aquacontroller to switch to a second pump feeding into a nielsen reactor at night? Any ideas would be greatly appreciated. Thanks