Possible that the firmware is in need of updating especially since it is new. Many times hardware ships without the manufacturer ensuring the latest software has been updated.
The container volume and refill are separate in the app.
If I remember correctly I had to plug the doser into a laptop to set up the WiFi. Once that was done, I was able to connect to it with the Android GHL Control app.
Try posting in the GHL Sponsor Forum section:
http://www.reefcentral.com/forums/fo...play.php?f=527