First times a charm - zkittles auto dwc

Going out of town for a few days so decided to rig up an automatic reservoir top off system. So added a new 15gallon "pre reservoir" with air stones and a timer pump. Every 12 hours it will kick on and send 2 gallons to the main res, where there is a float valve to shut off at a high water level. Also the tent has a flood sensor if tripped will kill the power to the pre pump. Should be safe to leave for a few days.