Todays progress included connecting the sewer pipe to the septic tank for the main house. This was a little tricky but turned out perfect. The upright pipe in the picture are 4" pipes as cleanouts connected to the 6" sewer pipe. All the septic piping is 6" diameter which will mean that they will be almost impossible to clog. The pipes for the drains are 4", 6" and 8" and connect to the grated drop boxes.