Thats interesting.
I am growing under lights and have been told to water as much as 15 mins every hour, which after seeing the drippers in action, seems a little excessive. Using clay pebbles as a medium, would you say 15 minutes twice a day is enough watering, or perhaps a little more. Problem being is I sleep close to my growbox and the pump is a little loud to sleep near, so the less it's run the better. Thanks for your help fellas.