Septic tie in
My septic cleanout is only about 25' off my driveway. Usually I pull in the yard to access it with my slinky. I am considering running an extension to the corner of the house next to the driveway. It'...
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1" slope in your 25' is more than enough slope ASSUMING you dump the black first. Plenty of grey water coming next to push any stuff still in the pipe. If you do not have enough depth to put a 90 on the new end, then I'd use 4" sch 40 PVC as your hose will not fit in 3" pvc.
