Use a fine screen if you are in fine, silty sand. I am from Louisiana, and it will silt in if you don't have a fine enough screen. We drilled a well with a gas post hole digger. Made a little derrick, put a 12v winch on top, and started going down. Your pipe is going to touch the sides, that is why they have to repair oil wells so much, the rods rub the casing. I have a real water well drilling rig now, so things are better.