I am install a PVC fence and I am wondering the best way to install the concrete around the posts. I have hear may different ways of doing it. I would like to know the best(easiest). Mixing the concrete in a wheelborrow and pouring in hole (time consuming). Next pouring the dry powder into the hole and adding water. and the third way is just pouring the powder in the hole and covering with the dirt. Could you give me any insight on possible problem with any of these methods.