I have 3 carboys (6 gal) in various stages of aging. They all have been degassed with the drill attached stirrer. I'm pretty sure they are totally degassed and since I'm bulk aging them, they would probably degass naturally anyway. However, I have since purchased a vacuum pump. My question is: is it okay to hook up the pump to carboys to see if there is anymore gas remaining? Will it hurt anything? Just curious. Maybe I just want to try out the pump.