My borehole's water supply is is very slow. I pump water ones a day. The control box switches itself off after 15 minutes every time as a result of the pump running dry. The pump is at a debth of 80 meters. The water level when the sump is full , is at 14 metres. My question is , is it safe to switch the controlbox on , and leave it on so it can switch on and off by itself , or is it stil safer for me to go on manualy as before ?